…an interesting answer from Garmin. I knew about 20 bikers including myself with this unit and full installation. There is no one who had faced out any problems with this guide.

@blakrj, I am with you and had the same thoughts...
@ Neil, yes I totaly agree with you, but there are some users who was happy with version 4.80, because they solve the SD-Card problem. I never had these problem and will stay with 4.70