I have a 420 and I do like the the outfitting. I agree that if you don't have a bulkhead (like a creekboat) that a shaped foam block is the way to go. The 2 problems I have with my Pyranha outfitting is that the screws are always loosening up so I check them everytime I paddle and tighten them often. The second problem is that the thin cord that goes between the backband and rachetts came untied and I can't seem to keep the knots from slipping. It sucks when your backband looses tension when you are not expecting it and you slide back behind the seat.