In a different league from ACR and DPP in terms of ease of use, Capture One was the first really good RAW file processor to actually use joined up thinking when it came to workflow. They obviously realised that most people will have more than one picture to process, and most people won’t want to adjust color, sharpening, tonal curves etc in one program only to have to it all again when you get the file into Photoshop. That’s not to say that Capture One’s simple to use - you have to learn your way around, but when you have, the options available and the speed at which you can work are impressive. The more you use Capture One the more you’ll like it.
Capture One images generally need no, or very little other work after conversion. That saves so much time. The program also allows you to work through images converting and saving each one as you go - processing images in the background as you work on the next. I’m sure you get the picture by now - I like Capture One.
So much so that Capture One 4 has been my RAW conversion software of choice for the last two years. Unfortunately for Phase One, that’s just changed. Lightroom 3 has arrived.