I bought my 7d with the kitted 15-85, on the basis that if I didn't like the 15-85, I'd be able to sell it for a good enough amount to put towards the 24-105. I already own a 17-40L and 70-200f4 IS L lens, and in addition to the 7d regularly shoot with a EOS-3 35mm camera, and therefore need full frame compatible lenses. It's 5 months now, and I still haven't decided what to do. The 15-85 has the convenience side sewn up, though I wish it was properly weather-shielded like the L glass. At the moment, the 15-85 is earning it's keep, and i'll most likely keep it for those "one lens days" and get a 24-105 for when I'm out and about with the full kit in the backpack.