I have a 15-85 on my 7D. I must say that I don't use it all. It's an upgrade from 450D + 17-85 USM, that I used all the time...
But for some reason, I kept my 50 1.8 on my 7D rather that the 15-85. It's just too much range. I love the wide angle, but never use it over 50mm or so. Plus, having so much range just makes me lazy to move around things. I just sit, go down range, stepping back and shooting then. I guess I don't need so much range, because I don't use it so much. Or maybe it's just a phase where's I'm having wondefull result with the high iso capacity of the 7D and the fast aperture of the 50.
I don't say it's not good. Actually, I have it for two month now, and I have taken maybe less that 200 with it.
But quality wise, it's well built. Image quality is really nice. But I dislike the focus ring being so narrow. It's just dumb: it was narrow on the 17-85 and everybody complained. They just made it smaller on the 15-85...
Final thought: Try the 15-85. It's a lot of range, but that what you are looking for a transtandart right ? Even at 85, it opens at 5.6 wich makes portrait good, as long as you have enough distance with the background. Plus, back at the time, going from 55 to 85 max range on my kit, help me to stop switching back to my tele zoom every two minutes.