I own an 8800 and an 8700c, currently using my 8700c. Going to start using my 8800 exclusively soon.
I own and run a clothing company that I am in the process of building up, and I use my Berries to stay on top of day-to-day business communications. I also use my Berry for personal use, I don't like carrying more than one phone, and the BB can handle it all.
(I did have a brief iPhone stint, but it's just not the same, and I'm more productive with a BlackBerry).
at&t has given me the most consistent coverage of all the US carriers, and given how they seem to get the BB's first these days... I'm pretty happy with them.
I love the look of the 8800, as well as the display quality, in my line of work style is very important, and this 8800 does style superbly.