Is it worth it to buy a GPS bluetooth receiver?

[pandaboy]

Is it worth it to buy a GPS bluetooth receiver for PPC 6700?

first of all, the price is really expensive, on ebay it varies from $50 - $120 (anyone know a place to buy it cheaper? I'm from canada)

Second of all, does it work?

Third of all, since it's bluetooth, can you use the bluetooth handset at the same time of the GPS receiver?

and finally, since the screen of the PPC 6700 is almost invisible in day light, would it be a waste to spend $100 on a GPS system and not be able to see it on the road? and not to mention the screen is very small

If you had experience with GPS bluetooth, please share them.