Wow I can't wait to see the "tactful" replies to this one!
Short answer: yes it's waaayyyy cheaper than you'll find it anywhere else. It's about half (or less!) that it should be with all of the included accessories.
However, it won't have the adjustment ring for hi/low. You'll get a spare tail switch that can do it in addition to the twisty and the single mode tail switch.
Oh, and you won't have much of a warranty in the unlikely even that something goes wrong. DX would replace a bad one if they sent one, but if it goes out months from now you're probably on your own.
I bought one of them from DX though and I LOVE it. It might be the best light I own in fact, and I have a ton that cost as much or more.