I have IP, which I mainly use for focusing, raw conversion, calibration and stacking. Then I go to Photoshop. IP has camera control, but I prefer to use the programmable Canon hand controller and leave the images on the camera for later downloading. The trouble with IP is that the updates are quite expensive--no free updates, so as time goes on, you shell out quite a lot of money. Recently I've bought a copy of
Nebulosity which is a lot cheaper than IP (Only $US45) and which seems to do everything that I normally do in IP, but I haven't tried it in the field yet.
Geoff