Bought one of these a couple of months ago.
Not a bad bit of kit, plenty of room for everything needed for the river.
The shoulder and waist straps can be improved though.
The clips that go across the chest to keep the shoulder straps from slipping are way to high and end up under your chin - and the waist strap is way to high as well, so doesn't do the job it was meant for.
Therefore neither get used on mine.
I opted for a chair with a shoulder strap (Nash Nomad I think) rather than clipping the chair to the rucksack.