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cant offer much but my exp. I use a SlimGPS 236 Bluetooth GPS unit with TomTom 5 and it's perfect for what I need! I opted for a bt unit as I wanted to use the 2 slots for memory cards.. Not many problems - the BT works really really well (even with the kakki Microsoft Stack) and the GPS unit uses the latest SIRFF III (?) chipset which is meant to be the dogs-what-ya-m-call-its.
A simple set-up IMHO, that works very well...
The other advantage of using a BT GPS unit is that I can use it on other devices that support it...
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