I’m only commenting on your statement that Quattro’s are not “waterproof” and saying that Phonak are not “waterproof” (and neither is any other HA that I know of). That’s all. Apart from whether ReSound Quattro’s are waterproof, sweatproof, or whatever, as I’ve commented elsewhere, they might have a bigger problem just with quality control. I’ve had three left HA’s go out on high-frequency response (and after the first, I was careful to never really sweat while wearing them, so I’m pretty sure it’s just a reliability issue, if anything more likely related to the dust, dirt, or dandruff-proofness of the device!). ReSound promptly replaced each and every one of them, probably with an entirely brand new HA body. But aside from reliability issues, I like the sound very much and I like the forward-looking aspect of the company, pioneering MFi with Apple and ASHA with Google and the very thoughtful and useful smartphone app, Smart 3D, which seemed to be the best of all smartphone apps at the time I was looking for HA’s (Aug->Oct, 2018). The fitting software (Smart Fit v1.8 now) is also an impressive piece of work and I like ReSound’s Audiology Online courses on fitting (but then I haven’t tried other brands’ fitting software so I might be ignorant of what I’m missing here - but I don’t need frequency lowering (yet!), for example). So it will be interesting to see what Phonak and ReSound do with BT LE Audio. If Phonak sticks to trying to build a walled garden with its version of Classic BT and ReSound forges ahead with BT LE Audio, I’m afraid I’ll just ignore Phonak on into the future.
I also can’t see paying the kinda prices that Phonak likes to charge for Roger devices and I don’t like playing roulette buying someone’s already used Roger device on eBay. And if my hearing and lifestyle stay the way they are, I don’t have such pressing hearing needs that I absolutely need the very, very best technology there is. I might buy my next HA’s at Costco but, unfortunately, Costco typically locks ReSound HA’s wrt fitting so TruHearing.com and my existing audi, who says she’ll fit me for any brand I want, may be the future purchase option I’ll want to follow forever.