we've just bought a howden's kitchen, using a mates trade account so with his permission they discussed prices with us.
I found them really helpful, we went in and spent a while with the door, handle and work top displays. Theyw ere happy for us to go into the warehouse to see the carcasses, and sinks etc.
While you don't get the showroom experience of some of the retail chains I think you can get a good idea of what you are buying - especially as there are quite alot of pics on the website too showing different cupboards etc.
We got 29 units, including some glass doors, big and small arder pull outs and magic corners, a sink, over 7 metres of solid wood work surface and a solid wood breakfast bar, some integrated bins and other gadgets for 6225 inc vat. we felt it was a good price. Had been offered something comparable from Wren, who we felt were the closest to Howdens in terms of quality, but the didn't have any styles we liked as much.