I agree with CFL. I have used them myself a long time ago, and their service was good. There was a post on the forum that they apparently ran into trouble in the past with selling some fake items
From what I heard from another member of the forum 4 months back, the Calvin Klein boxers he ordered from them turned out to be fake, but he could send them back. As CFL said, just watch out what you order.
By the way, next day delivery isn´t really special. If the items are in stock, every wholesaler will ship them out as soon as they receive payment.