I've ridden with a Mirrycle for a year. Feels nekkid without it. Now that I have two hybrids I'm getting another Mirrycle so I don't need to keep swapping the one mirror between two bikes.

And it's tough. I've fallen twice (slow speeds) and dropped the bike at least once on the mirror. It barely has a scuff on the edge. The mirror itself is undamaged. Besides being of very tough material, the design ensures it pivots out of the way. It uses a series of washers and tight fitting bolts to provide just the right amount of tension to keep it in place while riding, even on harsh roads, while still pivoting out of harm's way when I smack into a door jamb or drop the bike.

Also, in group rides, I've tangled with nearby riders on my left twice. In fact, the same guy, twice. Good thing we're friends. The Mirrycle just pivots out of the way.

But to reduce the chance of this happening again, I've removed the horizontal extension arm that extends the mirror beyond the periphery of the handlebar. Turns out I only need the handlebar pivot point (where the wedge lock is) and the mirror itself to get the desired angle and coverage. No compromises in visibility, and I can still adjust the mirror for side-to-side coverage as I'm riding. And now the Mirrycle has much less extension and is less likely to snag anyone or anything. I usually felt a bit nervous approaching bollards on the MUP bridges, but now there's plenty of clearance.

Keep in mind the Mirrycle is a wide angle view, so you'll need to get accustomed to guesstimating distance and approach speed. Easily done if you have similar mirrors on your car.

Very highly recommended if you want a functional handlebar mounted mirror for a flat bar or riser bar.