We have a pair of 2021 TRX
First is closing in on 80K. Only issue was part of the exhaust broke late last year which made it sound odd. Fixed with an aftermarket exhaust. No other issues.
Second is nearing 25K. Zero issues.
If you check out the hellcat forums you'll find a lot of high mileage 6.2l success stories. I'm going to keep these until there is something truly better available...and I don't see anything on the radar at this time.