Are any of you using the traffic receiver (not the Bluetooth gprs phone solution)? Haven't seen much on the forums and reviews I've been reading regarding traffic (just that there's a receiver available).
I exchanged my 720 for a 920 a couple days ago (the 920 is basically the same hardware and software with more storage and maps, a dead-reckoning sensor, the traffic receiver and a remote control). I live in the middle of nowhere in far southern New Jersey and have 50 mile commute to work in Philadelphia.
It didn't surprise me that I couldn't get any traffic reception around my home, but driving West towards Philadelphia the receiver locks onto a channel about 20 miles from the city. I don't have enough experience to say how accurate the info is, but it's all there and appears to update quickly - it looks very cool. Downtown in Philadelphia reception was fading in and out because of the tall buildings (I assume).
My main disappointment is the physical form of the receiver, cord and antenna. There's a very short cord going from the recever to the GPS, then a longer cord that serves as the antenna. There are several suction cups to mount all this on your windsheild, and they don't seem to stick all that well.
I have my GPS on a home-made mount in the area of my radio/CD player - I don't like the idea of having it stuck to my windshield. So the cord connecting the receiver to the GPS is much too short, and it turns what is otherwise a very neat installation into something pretty ugly.
I guess I need to find an extension cord and see if I can lengthen that cord (sort of an unusual connector which is similar to a sub-mini stereo phone plug, but it's recessed). But I was able to get reception from the receiver pretty well by just plugging it in and draping the antenna across the dash. But the instructions say the antenna wire should run vertically up the side of your windsheild for best reception. Nevertheless, it seems like a really nice feature that will be useful in my area once I figure a more elegant way to mount it.
Regarding a comparison with Garmin, I've had 4 Garmin GPS'es - a StreetPilot 2620, Nuvi 650, eTrex Legend C and GPSMap 60Csx. I was going to upgrade the Nuvi 650 to a 760 but when I started playing with the Go 920 at the store I was really impressed. Aside from things which others have already mentioned, the speed and smoothness of scrolling, zooming and panning the maps is much, much better than the Garmins which tend to move in jerks. The rendering of the maps on the screen is also a lot more pleasing, and is totally customizeable on the TomTom. The 3d view on the TomTom is a lot nicer looking, with atmospheric haze applied to distant objects, stars in the night sky and textures which look like buildings in urban areas. I also like the fact that you can hack some things, since it's a Linux based unit, like creating custom menus.
When you connect the TomTom to your computer and run the "home" program, it will periodically upload a file to the GPS that tells the unit where to look for satellites. I find this lets the TomTom get a GPS fix remarkably fast. The Nuvi 650 was good at this, but the TomTom seems better (and the Go 920 can also use internal sensors to track you inside tunnels and other obstructed places, although I haven't had a chance to see how well that works yet).
But there are a number of minuses too. I can't get my Verizon Samsung phone to pair with Bluetooth on either the Go 720 or 920. This isn't a big deal for me, but I'd prefer to have it working (I have no idea if it would work on a Nuvi 660 either though). There also aren't any topographic maps from TomTom, and I really liked using those on my Nuvi (so I need to bring my 60Csx when I need those now). You can't really choose how much detail the TomTom will display at different zoom levels, but the Garmin has a rudimentary setting which affects this (detail can be set to Most, More, Normal or Less). This tends to make minor roads disappear unless you've zoomed way in. Probably not much of an issue for most people if you leave Autozoom turned on I guess.
Also realize that you can't turn autozoom off on the Garmin Nuvi's, which is something many people aren't happy about. The TomTom Browse Map feature is really great. It displays a 2d/North Up map full screen which you can live-zoom in and out with a slider. These views are really detailed and the pan and zoom incredibly fast as compared with the Nuvi which is much less responsive.
Another real annoyance on both the 920 and 720 is the amount of RFI which they emit. When I turn my GPS on it pretty much wipes out all of my AM radio reception. This is something which none of my other GPS'es ever did. Strong local stations are OK until you drive past a building or something which blocks their signal, then you get loud interference again. This might not be an issue for lots of people, but I like to listen to distant AM stations while driving at night and the TomTom completely wipes them out.
So I'm happy I switched to TomTom for the time being, but of course I'm still looking for the "perfect GPS"
Am giving my Nuvi to my daughter and I'm sure they will love it since it's their first GPS. I don't think you can go too wrong with either unit. Try to play around with them in the store side by side if you can.
Also note that the Nuvi 660 is discontinued and being replaced by the 760 which has some nice upgrades. It can display a tracklog (trail of where you've been) which is a major omission on the TomTom Go. And the 760 can also save multiple routes that contain multiple via points. This is a big limitation on the Nuvi 600 series - it cannot save any routes, and the current route can only have one waypoint.
Happy shopping!