I just bought one. I upgraded from a Palm treo Pro. So far, loving it. I am not worried about tomorrow, because there will always be a bigger, better device out there. If you want bullet proof, get something else. The phone I had that always worked without a restart was a motorola RAZR. The more features, the more issues, which is why carriers dial down the phones features.
In the meantime, I'm loving it. Granted it is not flawless, but so far, it is a lot of fun. I also owned an ipod touch, which I took back after 3 days. This, for me, fills a perfect niche.
If you are going to be unhappy with imperfection, then I would not buy it. But the pros far outweigh the cons. imo.