Does anyone have experience with a similar setup? What are your thoughts?

I recently bought those. Haven't ridden with them yet.

But I have inner bar ends on this bike and they're great. I'm hoping the SQLab inner bar ends offer similar functionality.

I have Koga Denham bars and the Velo Orange Crazy Bars (V2) as well as the Surly Moloko so I am sold on the concept but mine are built into the bars so I have another grip position that is not covered up by a mount for the bar end.

I am all for alt bars but getting the SQ labs is a good way to start and get the addiction.

Here's what I did before converting that bike to drop bars:
Franken Bars...Small Adjustment, Big Change!

I have smaller thumb rests on a flat barred Continental. Not a complete inner bar end. They're handy. I like them. That bike is going back to drops, but I'll use them elsewhere. They satisfactorily provide for a welcome rest from the same grip all the time, by simply allowing the thumb to rest/grab atop the bar.

Flat bar + inline bar ends 👌 Great on climbs and the road, a lot more confidence descending, too. The thing is it's easy to forget that it's not my hardtail MTB with front shocks 😅
I've got full-on bar ends on the inside and it's great. Gives me an extra hand position and slightly more aero as well, really helps for knocking out those tarmac miles between the gravel and dirt sections.

I have a set on my plus bike. They add a nice hand position. You don't want to go over the handlebars is my only warning. If one of those hits you in the chest as you're flipping over your bike, it hurts like the dickens...

I'm guessing for better aero or to duplicate position from your drop bar bike? I was planning to put bullhorns in place of my flat bars, until I realized that bar ends, on the ends, is a lot more comfortable at 58 cm width than 40 cm width on the bullhorns, at least for my shoulder width. Plus, due to more leverage, my hands don't need to pull and grip as hard during climbs. Less aero, true, but I'm all about comfort, and I have clip-on aeros for aero, though I want to raise them about 75mm for comfort.

FWIW (prolly not much!) I did try a set of inner bar ends a couple years ago. Completely understand the appeal (quasi-aero bar position) but they were not for me. I gave them a good try, but couldn't get comfortable with that position.
Quickly went back to my usual set-up: 58cm flat bar w/6 degree sweep; Ergon grips with integrated shorty bar ends. Works for this old man (73).

I have the SQ Labs Inner Bar ends and I like them. I am probably on them 80% of the time. They made me forget about going to a drop bar bike. I can also apply the brakes when I am on them.

See this this post for pictures

Do people ever do a "Century" ride on a straight bar?

I also use SQ Labs Inner Bar Ends, and am a fan. I love them for cruising, primarily, as the narrow grip stance is both more comfy and more aero, so it feels really efficient for me to get into little tuck and just reel off some miles.

EDIT: I should add, for clarity, that the SQ Labs units I use-- and pictured-- are the longer, more shapely, 410. I have 411R Carbons, but I don't use them because I don't like the shorter length and hollowed-out underside. Having a full bodied handle is more comfortable for me, though the carbon fiber units are very attractive for their lightness.

I’ve tried a lot of bar options, including these. Straight bars, with or without these, are not my preference. For something more upright, I just use touring bars (North Road/Albatross Style) and a very long stem. If I had to use a straight bar, I’d rather not have these on it. As always, YMMV.

Otto

I bought these cheapies on Amazon. Did not research my choice much but wanted more hand positions for a longish gravel ride. They were OK, allow for a lower position when that is an advantage; but, seeing these other set-ups = a longer extension would have been better for my big hands.
Not really a gravel rider, so not contemplating an upgrade.

and in action.

Gosh I'd swear those were mounted backwards, but the labels clearly say L on left and R on right. I don't grock how the hands fit on those, unless they are just forearm rests.

The flat bars also look backwards or inverted, swept forward and not back, but perhaps you prefer that for wrist angle.

That appears to be a hugely long stem, I would guess a lot of tillering (lateral movement) when steering.

Sorry you don't like the look. Not really a mtn bike, but sometimes one needs to get off the paved roads.

edit: TBH, i never took to the paint job - but i believe in Let it Be, Let it Be, Let it Be, Let it Be, There will be an Answer, Let it Be.

(above) Oh, I don't dislike the look at all. I just can't figure out how the bar ends work in terms of hand grip, and the stem length is a bit unusual, which can add stability with that length, but my guess is, might have a negative effect on steering agility.

Just FYI Russ, of Path Less Pedaled, is working with Merry Sales to design hinged bar ends so you don't have to take your whole cockpit apart to put them on/off.

not enough leverage for proper steering

Huh? I'm on mine at least 80% of the ride and have no trouble steering. I even use them on unpaved trails and the only time I need to get off them is if the trail gets windy or technical, and for some low speed tight turns on the road.

See post #2 video, and my pics linked on how comfortable and controllable the bike is.

I don' t recall that the SQ Lab units required grips and brake levers removed; the clamp just spreads open after the bolt is removed, and they "snap" right on the bar. That's certainly true for the carbon fiber ones, but I think also for the regular 410/411s, too.

Also, there are lots of hinged inner bar ends available-- e.g. Spirgrips https://www.rosebikes.com/spirgripsr...r-ends-2667879 -- so I wonder what Russ' particular take on the design will be?

You have to remove everything to install the 410/411.

They are now available on the soma fab site and 30% off for black Friday sale

They are, and they're not cheap, but the design is interesting. The clamp parts are here. Short extensions, long extensions.