I guess they will be just about the same price on genuine Suzuki parts, as I think Suzuki have fixed price policy (although some outlets appear to discount)
Price wise on other bits and bobs they are on a par with other dealers.
Price isn't the only factor for me on some bits, it's the service that counts. (you know the story, bike in bits, needing a part ASAP, that you didn't forsee. They always get bits really quickly.
Worth mentioning that I ordered my Kawasaki ZZR1400 through them, even though they are not a kawasaki dealer. I was so pissed off with the main Kawasaki dealer round here never returning my calls etc, that I just asked St Neots MC if they could supply one, had an answer that day and the bike in less than a week.
I tend to "vote with my feet" and poor service from a dealer, means I don't normally return.
I also run a track bike and they have been very helpful with partsfor that. Air filters, Power Commanders etc and recommended a good dyno centre.
I guess Flitwick Motorcycles are worth a mention as well. I don't use them often, (my wifes works near them, so somtimes she collects bits for me - so handy). They have supplied a few tyres for me when I have been stuck and they were very helpful and a pretty good price.
I tend to buy my tyres in bulk, from Bell Motorcycles in Wales, he's very good and very cheap on job lots, especaially track tyres.