I have a Master Twilight Series 8.25 and I love it. Search my posts and you will see plenty of debate about Master. A lot of the bad reviews are because of stuff that doesn't matter IMO so keep an open mind. A lot of dealers and some techs, but no end users, post the bad reviews.
Artesian is a premium brand for sure.
Can't stress enough the importance of wet testing, especially since hydrotherapy is high on your list. Yeah dealers are closed right now. He patient and wait that out. This is an expensive purchase. More than that, it's your health.