I believe that Costco staff will clean your aids at no cost as long as you own them, and they’ll be happy to give you new domes and wax filters; they certainly did those things for me with my out of warranty aids.
But the warranty is 3 years. If you need repairs or, say, new receivers or molds after the warranty expires, you’ll pay. I believe the warranty on the molds is 12 months, not 36.
I know that the Pro 10s and Pro 20s have the same specs as the Nexia 9s. I watch my audi (yes, audi) at Costco as closely as I can when she works with the software. She’s very fast, so I can’t be sure of this, but it looks to me as if the Jabras show up in the s/w with an 8xx ID. My guess is that Omnia 9s, etc., would show up as 9xx (or 7xx or 5xx or 3xx). That makes me think my EP10s fit between the Omnia 7s and 9s. That may be marketing bull, but it may mean there are some differences between the Pro10s and Omnia 9s. If that’s correct, it probably holds for the EP20s vs Nexia 9s.
Why does anyone care if a Costco offering is or is not exactly the same as a major brand’s top model? HAs are far from perfect. All one can hope for is an aid that provides help that is good enough at a price that is within the buyer’s budget.
Given the cost of the newest aids, I’d be happy to pay Costco prices for aids that are, say, a generation back from the major brand’s top current model. After all, even today’s newest and best will be surpassed in a matter of months. Chasing the newest tech is a loser’s game.