We had a few problems but nothing as serious as poor guy with the stroke.
Our raft looked smooth and level but we still ended up using a self levelling resin screed to make the surface suitable for a karndean floor. We did the screeding ourselves, it's not perfect but it's a self build. The stuff we used was the Mapei ultraplan, mixed up a bag at a time with and electric stirrer. It goes off very quickly so you need to have everything ready before you start.