I also wanted to buy a Pioneer 530 and take advantage of their cheap offer. You have to pay £10 to join. Personally I wouldn't use this company for two reasons.
1. The Membership card took over 3 weeks to arrive. (I did get them to give me the number by email, so I could order my 530, this was after a week).
2. I ordered my 530 in August. a week later they emailed me to say they didn't have it in stock and it would take 6-8 weeks to arrive. And did I want to wait... stupidly I said yes. Five weeks later they cancelled my order claiming they had problems with getting the 530s from Pioneer. And they would be removing this model from their website. I see its still there.
I went to digitaldirect.co.uk, and paid a little extra. But, I got it two days later. I have asked cheapelectricals for my £10 back but heard nothing. Dont waste your time!