I like it a lot. My wife is home with our baby so even tho it's for her, I've been using it a bit myself. Not much help for just driving to work obviously, but I can see it being very useful in a lot of situations. This is our first gps so I don't have much to compare it to, but so far it does everything I expected.
I read that because of the non-flip out antenna that the satellite lock is much slower, but it seems ok to me, locks in about 20 seconds. Takes up to 60 seconds if moving.
The routing is nice, which is the main reason I decided to bump up to the 700 series as opposed to the others. I put in a route from San Diego to Miami, to Limestone ME to Anchorage AK and then back to LA. It was maxed out, it says it will update me with more info as I travel. The map only showed a route out to about halfway between Limestone and AK, beyond that it just faked straight lines to the last 2 stops. Total distance was nearly 10,000 miles, so I think most any road trip should be covered!
Also impressed with the FM transmitter, I've used those before and they never worked good for me, in the Chicago burbs, but this one actually works great! Not sure if it's because it's just transmitting voice and not music, will have to try with some tunes but there was almost no static.
I like that the power plugs into the dash mount, (I've read some don't do that), and that it powers on when you start the car (again, I've read some don't do that). Not that I would ever leave it in my car, on the mount, waiting to be stolen. It's just one less step, put it on the mount and go. Am going to look into having the power hardwired in so there's no dangling cable.
POI's seem good but I have found some holes, for instance I put in Kohl's and it found a bunch, but not the one right down the street that has been there for years.
Hmm what else... I had read that there were issues when entering addresses, that you had to put the city in first. The 750 does not do that, you can just select search all instead and then type in your address, so you don't need to know the city. It does not correct spelling when keying in POI's, which would be nice and I think some others do.