This “new” area does not offer much that my Aera 796 that I bought in 2012 does’nt. Same size screen and presumably the same reasonably priced database subscription. I have been very happy with my 796 though have never subscribed to XM weather though it is capable as received with antenna and all. I use the GDL 39 3D for ADS-B in and attitude and synthetic vision. I guess the WiFi function is a nice addition, but I don’t need it.
I just hope that I can continue to get updates for my 796. Garmin is famous for obsoleting equipment while it still functions perfectly. Since I have two planes and can only fly one at a time my Aera 796 fits my needs perfectly.
I have always refused to buy any overpriced Apple products which really are not designed for aviation use.
I am sure the Aera 660 is a nice unit but see no need to replace my Aera 796 which came with an external antenna and the other capabilities and has had software updates to keep it up to date.