1. As to the lens....I love mine (both of them). The range is extremely useful for my railroad photography; trains don't stand still. It's not quite as sharp as my 300mmm f4.0 or 400 f5.6, but it is still excellent. Nearly all of my favorite shots have been done with that lens.
2. B&H (and to a lesser degree Adorama) is without question the big dog of camera equipment. They are big, impersonal, generally efficient, with the best prices and inventory. Their success has been a magnet for the worst of the breed (the crooked dealers who tend to make us skeptical of dealing with all NY-area resellers).
3. I'm waiting for a definitive statement (from someone in a position to issue such opinions) as to what the ramifications are of buying grey-market merchandise that may someday require warranty repairs. I've heard several conflicting opinions, and frankly admit to being very confused on the subject. Usually the price differential on a single item is small enough that it's hard to justify buying 'grey', but over time, it would certainly add up.