My company just rolled out a bunch of Treo 700wx and Moguls, so I've been playing with both over the past few weeks. Personally, I love my Mogul, way better than the Treo in my book, because I'm a gadget geek
Battery life isn't as good on the Mogul, but it's not terrible. It's good enough at least for my needs and I use it A LOT, but it's plugged in at my pc for half the day.
I haven't tested bluetooth on the Treo, but it has to be better than the Mogul. I'm starting to get the same complaints from callers about the choppy sound as the people in the BT thread.
As far as signal, I've seen no real difference. When I have them side by side, they are dead even most of the time.
I haven't tried tethering, but it looks like people are having success
here.
All of the pros you listed are dead on. It's awesome to be able to flip on my wifi at work, and watch our security cameras over a fast, steady connection.
The one pro for the Treo in my book is the dialpad within the keyboard. Much easier to dial a number while in the car (I didn't say that) with something you can feel, as opposed to dialing with the touchscreen. So other than the somewhat longer battery and the dialpad on the front, I see no reason to stick with the 700wx, IMHO.