I've had nothing but luck with them. I've bought two Canon s90's there, my 70-200mm f/2.8 VRII & a spare battery. My Dad has bought a 55-200, 35mm f/1.8 & battery from there too without issue.
Delivery is pretty quick (3-4 days for me).
One downside is that while lenses have international warranties, often that's not covered if it's not an "Authorised" dealer. That said, DWI do offer a 1 year warranty I believe (or you can pick up a Mack warranty to be extra safe).