Nowt wrong with them great value & decent kit, just be aware theyre usually a bit more XC angle wise. Might be a bit of a shock after the more relaxed 456. VFM wise also take a look at Canyon bikes & KHS, both sold direct from the manufacturer, so again great value for money. The Canyon Nerve (£2k bike to be fair) got a great review in last month WhatMTB, with the added bonus that the kit loaded onto the bike was worth £2k in itself. Some decent bargain around, though with the draw back of not being able to test ride them first (canyon IIRC will let you return the bike if you hate it within a limited time window, as per Wiggle?). Also worth a quick scan of Wiggle Kona bargains, if there any left.
Lots of bargains about, if your not a brand whore, have a look round first before jumping in too quickly