I think Adorama is great. I have made many purchases from them over the last 4 years. Customer service is prompt and professional. I had no problems with B&H either...they also do a fabulous job.

Just out of curiosity I sent an email to the contact listed here for discount prices through TDP. The quotes he gave me on the Canon 70-200mm f/2.8L II IS USM and the Canon 24-70mm f/2.8L lenses were the same as on their website....in reality no special discount. I don't know if this applies to all items but I could not get any special price on either of these two items.

This does not discourage me from using Adorama but they may not be able to offer special pricing on all items.