Domes are critical and newbie HA wearers don’t know that they may benefit from a different dome. I have had my KS10’s since May 2021. Before the KS10’s came out I had purchased a set of Phillips 9030, and KS9’s in March 2021 to see which I liked better, then purchased the KS10’s, so trialing 3 different HA’s would have been impossible if I hadn’t switched to Costco.
I didn’t like the closed domes on the KS10’s so I tried my open domes and had Costco adjust the programs, they became my favorite of the 3 and I returned the Phillips and KS9’s. I couldn’t get my previous private HA fitter to listen to when I asked for program changes, Costco has always been open and wonderful about changes I ask for.