The 650 is nice, I never had a problem reading the screen. The preloaded interests are cool, its like having the yellow pages. And your right, the 650 is the same as the 350... just a bigger screen

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I had the 350 and replaced it with a 650. It is basically a 350 with a bigger screen but it does have some updated features. One major feature is that you can add a stop to your route while en route. With the 350 it would have canceled your entire route. It's nice if you decide to map a detour on your way to your final destination. There are some other view and interface upgrades. I can't remember them all but one allows you to remember your location by touching the arrow on the map.

There are a couple of physical differences aside from the screen size. They do not use the same charging cable or mount. The 350 accepted a mini-USB in it to charge. The 650 requires the mount to charge as the cable plugs in to the mount, not the 650. The 650 does not come with a case either as the 350 did.

The best part is that you can usually find the 650 for about $350 or less. I got mine during a Costco promotion. I do not want BT either and traffic updates are unnecessary for where I usually drive. The newer Garmins include MSN info and that requires a paid subscription. No thanks.

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Thanks for the info. The point about not being able to power it via the mini usb is a minus for me. My current GPS is powered in my X5 via the mini USB connector. When I installed my first GPS several years ago (a Garmin I5) ago I hardwired it via the a mini usb cable. I did the install so as the cable is not apparent and comes from inside the vent. The 350 works perfectly with this too as well as few other GPS that I tried. I would like to reuse this solution for my new GPS if possible rather than having to rewire it.

I'm late to the party again, but I got the 660. It makes the BMW nav seem to be 50 years old in design and interface. There are many Garmin models out there, but I would think all the newer ones would have a similar screen and interface.

The 660 has BT and mp3/4 capability. I put my iTunes and Amazon downloads on it. It paired up perfectly with my iPhone. You can of course not use the bt or mp3 feature or get a model without them.

You should run it through an aux cable rather than the fm transmitter. Or just use the built-in speaker.

It is extremely clear, high-def looking that is very bright day or night. It is easy to read with polarized sunglasses.

The BMW nav has more POIs.

My plan is to integrate the best features of the BMW, the 660 and the iPhone as much as possible.

The are the Dices, the snap-on phone adapters, aux inputs...I don't know.