I have just installed and tested it. The first thing that I have noticed is that vibration after touching the screen can take be up to 1 second long on high loads. On non-BFS kernels vibration was always very short (and on high load there was no vibration at all as device was not responding at all). I did a test with app manager - and it was certainly better than non-BFS because even with high load and paging I was able to interact with UI. But it was far from smooth. So far it is good. If I find anything interesting I will post here.