I have the octagon 20 and it's been fine no problems at all. It's constantly on the move if you have the turning cradle so any movement is very gentle.
I have to say when I first got it the angle of turn was pretty scary at first and I had visions of eggs falling out but if you take care setting its good.
I do have the turner, and it seem to be very good with the way I've packed the eggs. Only 1 egg is too small, and it keeps tipping over. But at least it's tilting with all the others.
I just got mine, and this is the first hatch I'm using it for. I'm hoping it lives up to it's hype!