I do a lot of YouTube watching/listening to, and I find it's great for doing that and messaging my GF. I have the any app mod done as well, but Twitter is so far the main officially unsupported app I use.
The feature isn't a deal-breaker, per se, though I'm getting used to it and think it should be a part of every phone in this day and age.
IOS too, now that they have screens big enough for it.