Seems like a good time to strike on a 700, with Logitech offering a fifteen buck rebate and Amazon offering it at a reasonable price. You have to buy before Tuesday for the rebate, and I haven't had a chance to actually touch one a 700, and probably won't before Tuesday.
My question is: Are you 700 users happy with the feel of the buttons, particularly the transport buttons?
I currently use a Harmony 550 and I don't like the feel of the buttons at all.
I had a 676 until a few years ago and loved the feel of the buttons - nice crisp response. After it died (fell apart really - the USB connector just snapped off when I plugged a USB cable in to make a change), I bought the 550.
It's hard to tell if a button press on the 550 has actually registered, so I'm in the habit of making my finger hard and pressing my fingernail straight down on the button to make sure my press registers. Do that dozens (or hundreds) of times a night, night after night, and it gets quite annoying.
(Contributing to my frustration is that at the same time I got the 550, I replaced a DirecTIVO DVR with DirecTV's HR21, which is soooooooo much slower to respond to and implement commands - it often takes a few seconds or even more to respond. It's hard to tell if a failure to respond is a failure of my button press to register, a failure to point at the HR21 or the HR21 just not doing anything yet. So I end up repeating a lot of button presses. If I still had the DirecTIVO, the feel of the 550 buttons probably wouldn't be that big an issue. But the HR21 is what I've got, so I need a remote that's well-matched.)
I'm controlling five components (TV, HR20, AVR, PS3, Logitech Music Anywhere), so the six component limit isn't an issue for me. (If I expand later, I could live without controlling the Music Anywhere thing too.)