This may surprise some people but I have a TT3 and an HP 2210 with bluetooth GPS. It did not work!
Boo!

you might say and to be fair so did I but....
I rang Total PDA who gave me the number for TomTom customer support who answered very quickly, were extremely helpful and friendly and correctly diagnosed a faulty Bluetooth unit. I explained that I was going on a trip in 5 days time and the engineer explained that they could not promise delivery within that time, however 3 days later a gleaming new bluetooth GPS reciever was in my hands!

I can at last report that all is now OK and it did a sterling job guiding me round obscure parts of the lake district with no lockups at all!.
It is very easy to post what is wrong as when it just works there is little to say but how good it is!.
Thankyou TomTom support whoever you were!