I use/love my CNX80, and would like to have the 480 as a backup, but considering the lack of support from Garmin, the 6 AMUs is too steep for me. As smart as the unit is, even half that price is a gamble. If the unit goes TU, not sure anything can be done for it. It's the same reason I couldn't justfy the money people are asking for 430W and 530W units they are selling when they do their panel upgrades. I've already been burned by Garmin's lack of support when my MX20 died. No help/available service from Garmin. Obsolete Garmin units are great as long as they work, but the lack or factory support for them devalues them enough to make them a huge gamble.