I lost confidence with the one advertised on B&H after another poster here said he contacted their customer service and their reply was it didn't work with T-Mobile. So either they are not getting true RM-938 units, or the cust svc rep may not have known what he was talking about. Probably the latter, but I am not in the mood to roll the dice to find out for sure. Also noticed their product page stock date has now slipped to "June 2 2014" for all color variants.
Cancelled my B&H order on Tuesday and placed the order with OmegaCell instead, as their RM-938 product page specifically lists AWS (T-Mobile compatibility) and LTE (AT&T compatibility) and their site said they would have stock this week.
Sure enough, I received a shipping notification email from OmegaCell early this afternoon and now have a FedEx tracking number for my unicorn.