Depends a lot what you want to do (and what your local rivers are like). I've been out of paddling for ages now, but looking at that it is quite long. Makes it more stable, but less good at paddling where you want to turn corners, or playing in white water. It looks like it will go in a straight line pretty well though – so probably great for paddling canals, and easy rivers etc.
Personally, if you're a complete beginner, I'd try joining a club or something, then you can see what kind of paddling you enjoy, and get a much better idea of what kind of boat you'd like (and learn how to roll it, which is always a useful skill). You might find you like playing on white water, and want a ludicrously short fat boat to do rad dude tricks in, or you like racing kayaks, and want a silly narrow unstable pointy boat.
Having said that, if you picked that up for £150 or so, you'd probably get £150 worth of fun out of it
Joe