I don't know that 10% off is a great deal, but I never have seen the reference series discounted at all before.
I really like my Klipsch Synergy B-20's for the price and I have always wondered how much of an upgrade the reference series would be, but I haven't had the opportunity to audition them.
I just noticed that this is a single reseller with only two pair left in stock. Everyone else is still at $299. I'd check his feedback before buying.
By the way Best Buy and Amazon both have about 10% off on the Klipsch Icon bookshelves. I don't consider that a great deal since I got my similar B-20's for a lot less than the $220/pair the Icons are selling for.
Pioneer Elite VSX-43
2X Bang & Olufsen Beovox S75