Hi there,
I bought that exact same model stereo from those exact same people!
Very good service in terms of delivery, and the stereo is ace. However, after about 2 weeks the radio seemed to pack in, if I put it in tuner mode nothing was happening, and the electric aerial wasn't moving either. I sent them a mail asking about their returns policy and to date haven't heard a reply (this was about 3 months ago)
Anyway, I tried using the reset button on the unit (jab with a parker pen did the trick) and it sorted it, I just had to retune all my stations (one button does an auto tune for you though)
I also bought the sony Xplod amplified subwoofer from them, and that thing is just awesome! The standard speakers up front are fine for mid and treble (the rears are crap but they don't matter unless you drive from the back seat) The sub woofer makes such a difference (besides shaking ALL the mirrors on the car

)
Wiring it in is easy enough too (on a 626GT) as all the trim just pops off dead easy, took me about 2 minutes torun the pre-amp cables down the right hand side of the car, another 5 minutes to run a power cable form the battery through the bulkhead and down the left hand side, meeting up with the remote switch on for the amp.
Sorry, have digressed - needless to say the head unit is ace, but BUY THE SUBWOOFER, you won't regret it. Your neighbours might though.
