Realize that there is a difference between a reputable dealer unknowingly selling you an item that was defective from factory and a dealer who is trying to scam you.
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Look them up on resellerratings.com and compare them to some of the scams based out of NYC?
I use them almost exclusively. They have given me nothingbut top notch service. I spent around $20,000 (US) there in the last year. Great service, great people, and they even speak english on the phone! (sorry, but that is a huge bonus for me).
I can. Even when I over night items and don't receive them due to the shipping company not keeping their schedule, all I have to do is call B&H and they take care of the problem for me. B&H and Adorama are both upstanding retailers.
If either of them were to sell you a defective product (there are lemons everywhere even in local stores) it would be without their knowing, and it would be taken care of very quickly and easily.