I found mine a bit twitchy for the first 3 weeks then adjusted the rear to the low position and seemed to make a big difference for me. Doesn't feel twitching now. Especially climbing around corners needed to lean forward but don't now with longer chain stay length.
Mine came off on first ride. Rock flicked up. might have opened the door and cranks did the rest maybe. Didnt realise until I got home. taking a couple of months to get a new one. But been riding fine without one