I have just picked up my 540 GTX today. Delivery supposed to be 7-10 days (OK, they do say allow up to 28 days) actually took 20 working days (order date 31 March). Main problem was trying to get someone to give me a realistic date, rather than broken promises to call back or complete system. Got it home and found that the MS Office that I had ordered was there, burt not installed, perhaps I was mistaken in my assumption that they would install it, still no problem. I actually rang the support number to check this out and they answered in a couple of rings and actually spoke common sense.
So it's fingers crossed at the moment, apart from this (and the enormous bloody boxes to shift around)everything went together as it should and I would appear to have aspeedy system.