I've got at least some experience with all three... What I've seen:
IC - works well, but can be slow (especially if you plan to step up to 10 gallon batches or larger).
PC - works really well, but I wouldn't try to use one without a pump. A friend of mine has one that he uses exclusively, and it only takes a little throttling on the pump's output to zero in on the exact temperature you're looking for. We recently chilled a 12 gallon batch in about 10 minutes. Cleaning can be a bear though; we always use hop bags to minimize the hop material that could get stuck in the plates, and it takes a while to flush and backflush the thing to get all the sediment out that still makes it into the PC.
CFC - I just got one of these for my birthday, and I've gotten to use it once. I tried to gravity feed through it; I'm going to experiment a little more with heights and such to try to get it right, but I think an investment in a pump is in my future - my first attempt using the CFC brought 6 gallons (or so) of wort from 200+ down to 52F, in about 15 minutes, because the flow rate was very low. I suspect that with a pump, or a better figured height differential on the gravity feed, I could get a much higher rate and a little closer to appropriate pitching temps. I feel like it was easier to manage than my buddy's PC though; no worry about hop bags or anything, and only a few minutes flushing everything out with hot oxyclean and hot water.