I've bought everything from Camera Lens to bags for my equipment here. They have the largest selection of specialty items, some of the deepest discounts of any photographic supply house, and some excellent right on customer service.
My experience with them has always been pleasant. They know their stuff, and you can call them with questions which they will be happy to answer.
Shipping is always fast, and the goods that I have received have always gotten here in the best of condition, which is important when considering optical equipment can be delicate. I also bought a Dimage Scan from them which is one of the most important pieces I've ever bought, considering it has scanned and repaired some of my more precious photographic memories that can not be replaced.
B&H has great prices and great products and I would not hesitate to recommend them for hard to find optical equipment or great prices on everyday camera supplies.