I ordered a few bits after very careful searching and cross referencing, the 15% deal saved me a few quid but not nearly as much as they'd have you believe
I got my mafell track saw this way last year and saved a lot: I called them before hand as I would prefer to do business directly with the merchant instead of going through ebay but they would not honour the the ebay discount code. Paid about £550ish which was at least 100 cheaper than anywhere else.