Very good price, indeed. It's on my "Photography Gear" wish list in Amazon. This brings it down from the $599 it was last week, and the $549 it was yesterday.
Incidentally, I just pulled the trigger on an EF-S 17-55 F2.8 IS for $779 ($down from $829 a couple weeks ago). It's bobbed up and down from MSRP to this sale price a couple of times. Not sure when/if it will do it again, and I "need" it now, so I bit.
It didn't hurt that the 70D was also down to $1,049, too. When they announced the 70D last summer at $1,199, I was pleasantly surprised. Still, my plan was to wait 'til the holidays to see if it comes down much. Not sure it will come down further, but $150 off of release price is just about what I was hoping for by this time. Couldn't resist...
They should be in my hands next week, and I expect they'll make a great combo. I'm excited!