In June 2010, me and two other friends both with identical boats 'sailed' around 6 miles down the river itchen from Winchester to Eastleigh. We spent almost 6 hours in these boats and they managed to withstand scrapes, bumps, jumping in and out, being carried through thorn bushes and just about all the other abuse a group of 16 year old boys could throw at them.
By far one of the most sturdy inflatable boats out there. Excellent value for money. A definite recommend.