2gb card is sufficent for approx 1hr of footage. Needs good batteries and these only last about an hour too, so probably need changing after each use to be safe.
Can be a bit intermittant in working properly. But again at the rpice you cannot go wrong.
Great service from the company who keep you well informed on progress, and amazing it gets all the way from China/UK and the pesky not so royal mail did not even try to collar a fee at customs, which would have almost doubled the price. It is a bit slow from China, about three weeks but then what boat isnt :)