Works ok on my Touch HD. Kind of disappointing really. You would think a company like Microsoft would come out with a product to give Google Maps some serious competition.
The biggest benefit I get from Bing is the voice navigation. I sync my phone to my blue tooth car stereo and it works pretty good. The voice isn't as clear as I'd like but I read somewhere that it's optimised for the phone's speaker so I'll deal with it. I can still understand what she's saying. She even talks to me while I'm listening to music via bluetooth from my phone. GPS initializes faster with Bing than Google, which is a plus, but you don't get any indication of how many satellites you're synced to or anything like that. You just have to take Bing's word for it.
Working in the program is a pain. For instance, if you save a location as a favorite (providing Bing can find it) you have one chance as far as I can tell to give that location a name. Otherwise it gets a default Map Location number and you're stuck with it unless you want to delete it and save it again. With Google Maps you can edit your favorite locations any time. Sometimes the menu buttons and keyboard are very slow to react. Ok not sometimes, most of the time. And there's a setting to block sexually explicit content when you search for locations or directions. I turned it off hoping for the best but it didn't make a difference
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The maps load a bit slower and you don't get any valuable layers like with Google Maps.
If it wasn't for voice navigation this app would be totally useless in my opinion.