Bought my last car from them without problems. Its a bit like a Supermarket and the whole set-up is very streamlined. I just didn't believe it when I was queuing to pay for it and the loudspeaker said "cashier number 5 please" I would buy from them again but watch out for service history mine was an ex company car and all I got was a blank service book, insist on a fully filled in record.
Same here, massive place. Spend a couple of days looking at the website to see what's on offer.
Get there as soon as they open and look over the car as best as you can.
Mine was ex company with sketchy history but just looked to straight. Contacted last owners and for a small fee, had all the service history sent to me and boy what a history!
Bought and drove off same day. Post office not far away, but this old stomping ground for me as my late grandparents lived round the corner!