I purchased a Sigma 70-200mm f/2.8 from them and saved myself just over ?200.00 compared to the local price. They are not the best communicators but the lens arrives surprisingly fast (within a week if I recall correctly).
I’m currently based in the UK, and have bought a couple of items from them including a 1d mk2N camera. I’ve never had any trouble with them. I got the stuff through their ebay website. It might only apply to UK residents, but I always try and buy an item when it has NO Customs VAT to pay. Basically you pay the VAT when the item arrives, and email them the receipt and they pay you back…very quickly too. And they always respond to my emails promptly. Not sure if I’ll deal with them again when I move back home…but certainly won’t pay Irish prices for kit. http://www.bhphoto.com has the best prices of all….but again the dreaded customs VAT is almost impossible to avoid.