hi gauv, I've been tempted to buy some used ones for my Troll with dropbars, as I have ridden sometimes with people my age who are pretty hard core bikepackers and use them. They do big big distances per day and have done the Tour Divide ride etc.
oh, I agree that elcruxio's post is very imformative--and the part he mentions about the height they are at being important made me think of the riders I know , as their front ends on their dropbar bikes are fairly high, and so the aerobar setup is also quite high and in a comfortable position--which as elcrux brings up, the whole body, back and seat position issues that can come with too low an aerobar setup.
the comment about potentially losing the tops area could be an issue, although it seems to me your bike doesn't use drops no?
On long slow climbs, I use the tops a lot, and would not want to lose that hand position.
also, when I started looking at aero bars for fun, it would appear that there are lots of them with varying setup differences (height of arm pads, type of pads, flip up or not, width of pads, width and length of forward facing bars etc etc), although the Redshift stuff is known for being well thought out. (from what I've heard about them by folks using their flexible stems etc)
WRT Redshift -- I get them because they are removable. Clip-on aero typically just means that they can be mounted on a standard bar. Redshift slides over a bolted bracket so you can remove them in a matter of seconds -- very useful because I'll certainly fly and use public transit with the bike and wouldn't bother mounting standard clip-ons,
WRT fit -- I'll see. Probably applies more to performance oriented cycling, but frankly, I don't know. I'll update
WRT design -- you are absolutely right. There's grip design (S vs L, etc.); arm rest design (and quality); orientation, height, etc.etc. Just as there are infinite variations of handlebar models. And not being a pro, I don't have the resources to try/test them all, not even a fraction of what's available.
So, yeah... the plan is to (1) see if these are compatible with my current handlebars. (2) if they are, try various settings on short distances to get an idea of the potential benefit. (3) if promising, addressing the storage consequences (replacing the handlebar bag with top-tube and perhaps frame bag(s).