My Brother in law bought an FX2 from Pauls. No problems with it, came with a shock pump that I wouldn't have expected at this price. Pedals too, not great ones but ideal if you want the 'buy it and ride it' experience. Took it round Cwmcarn last week without any incident.
If you're willing to spend a little more, buying ther FX1 is a better bet though – for £100 more you get a 27 speed deore groupset instead of the 24 speed alivio, and the fork is a Rockshox Tora instead of the Dart. These would cost you a lot more than the initial price hike to upgrade. You don't get pedals though, so worth factoring this in.
Alternatively for similar money you could look at the classifieds on the forum. You get a lot more bike for your money when buying second hand, just make sure the seller's got decent forum history, not just a 'joined up to sell' type.