Kinesis has a 60-day money back guarantee if you buy from them, minus the cost of shipping. These are also sold on Amazon, which has a really good return policy so you can return the item with no hassle if you don’t end up liking it.
Of course, this is all presuming that
A. You have enough capital to buy the keyboard and are ok with not having $300+ for a month or two
B. you can get used to the keyboard within a 30 day period and get a feel for how you’d like to use it full time
Unfortunately their store was closed thoughout most of 2021 due to COVID. I orded a Advantage 2 from the sole NZ distributor who do not honour that deal. Cost 500USD only to discover it was very uncomfortable for an "ergonomic" keyboard. I dont think my shoulders are particularly far apart but I still had massive pain due to the ulnar deviation caused by the keywells not sitting at an angle that suited by shoulders.
Another few hundred dollars in mods to get QMK and lower thumb keys and while some other issues were resolved, I cannot type on it for more than a minute without intense pain in my left wrist.
Of course, this is all presuming that
A. You have enough capital to buy the keyboard and are ok with not having $300+ for a month or two
B. you can get used to the keyboard within a 30 day period and get a feel for how you’d like to use it full time