I have to say I was dubious, but I was wrong. Great product. I painted a whole room in 6 hours, two coats.
It really doesn't splash. I usually end up with flecks of paint all over my face and clothes, but not so this time.
No time spent re-loading a roller is great and the coverage is very even. No waste with paint left in the tray.
Couple of things to be aware of to get the best out of it, don't fill all the way up as it gets heavy and slides instead of rolls sometimes, as it gets emptier this sorts it's self out.
Also, don't paint with the filling cap pointed at the floor; it seeps a little after a while.
Follow both of those pieces of advice and it's really great. I just ordered 4 more :-)