Lots of opinions as 906UP said. The more technical your riding, the more a full locker is an advantage. If you're a casual trail rider, i4wd is pretty good. It does get confused in snow, slippery mud and loose sand and will hunt back and forth on the front. I don't ride in much mud or snow and have never felt it hunt in the sand.
One of our members is an extreme rider, he has both an i4wd Talon and a P1K with normal lockers. For 95% of the time, the i4wd is good. It's in that 5% where the full locker comes out on top. The Talon may still get there, but it gets beaten like a red headed step child to do it. My Talon has gone anywhere I care to take it, sometimes following guys who are better riders than I am, over things I'd never try alone (I'm solo 95% of the time).
I really like that I can flip it in and out of 4wd anytime at any speed, which I do all day - engage on uphills and steep downhills (so the rears don't skid due to extreme weight shift to the front). On slippery gravel roads, I might run it all day to keep from constantly spinning the rears.
I'm a two footed driver and that can mess with the i4wd because it uses sprag clutches, braking at the wrong time will release the sprag which will release drive to either front wheel. Fortunately, I occasionally ride with 2 other Talon riders and they'll tell me that both wheels aren't turning and that's usually because I hit the brakes just before I needed hook up. That's hard to avoid in technical climbing - pick yer poison.
I'm nearing 13k miles and am completely happy with i4wd.
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