I got my Resound Preza’s about 6 months ago and have been very happy with the HA’s and the service provided by Costco. As for the auto-switching of the programs, I use customized programs of the original 4 programs saved with my changes through the 3D app. Some of these customized programs are using the GPS location for program switching (home and golf course). I also use the Streamer 2 from Resound for attaching to 2 different TV’s and my computer. The programs for these streamers are also customized and saved in the 3D app. I believe you can add 11 personalized (saved) programs on the app to handle various situations. If you don’t use the GPS switching option, you have to manually choose the program via the app.
I have been able to handle just about all situations by tuning the HA’s through the app. When I schedule a follow up appointment at Costco, they adjust the HA’s to fine tune my programs.