I am an italian Apple fun.
I had the luck to buy an iPad in the US and now a can't stop playing with it.
I have jailbroken it (did teh same with my iPhone) and installed ROQYBT.
The version of ROQY is 1.1, it fully works, bonds to my GPS antenna and shoot out the coordinates ok.
I have tested it with the following:
1-iPad maps app - works perfectly
2-Google maps app - works perfectly
3-Navigon - can fix but freeze when I start a route guidance
4-nDrive - do not fix, do not "feel" GPS coordinates coming in from ROQY
5-iGO - can do everything but keeps "getting and loosing" the GPS with an effect quite annoying.
Would be happy to share my experience with you guys.