I like them a lot; they're a vast improvement. They look A LOT better, and work better than the stock Mickey Mouse ears (which I actually found to work pretty well). I've had to get used to the smaller view, but once I adjusted them properly that's been great. I love the way they're constructed - you know, quality of design and workmanship and such. What vibration is present when riding is directly relative to the roughness of the road, and I wouldn't expect any mirrors to overcome the normal shake of riding. On smooth roads, or at idle, I don't notice any significant shaking - very stable. They were easy to install, and my brother (who bought them for me as a Christmas gift) reported back that Kevin was awesome to deal with (no surprize).
How do you like yours? Can you post a picture for comparison since you have the shorts?