Personally, it is not big enough.
Back before I had a smartphone, I carried a phone, PDA, mp3 player, and sometimes a small camera. I was like Batman with my utility belt. Once I got my first BlackBerry, I was able to leave most of those behind (although my 8830 didn't have a camera). I can even do more now with my SGS than any of the BBs I had since then.
But now, I carry my SGS, and my 10.1" gTablet. The tablet gets used a lot more than my phone these days. It might be a little too big, but I would really prefer being back to carrying just one device. My wife has a 7" tablet. If it had telephony capabilities, that would be perfect for me. I always use a headset when I'm on the phone (I'm either taking notes, using the calendar, or looking something up), so I wouldn't feel like someone from the '70s with a huge boombox on my shoulder.
I already do Skype and GrooveIP on my tablet for calls while on wifi. Having full phone functionality on a tablet would be great. I'd be happy to leave the 4" screen behind.
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