I have the 150s on my commuter. They are steady but turn off when you stop. Brightness of the rear is about the same as a cateye ld600... not super bright but ok.
They vibrate a little. I've take one magnet off and they run much smoother, might put it back on in the winter. The thing that bothers me is how low they are. If you're riding beside a car they won't see you. I carry blinkies through the winter too.
Overall I like them.