I just went thru this decision. The SoftStartRV unit that I installed in June, 2022 failed on our last camping trip. I had purchased the unit from a forum member who sold his camper before installing the unit. When I called to get tech support, I advised them of the purchase situation. No matter, I had an email from tech support within two hours and a rapid exchange thereafter. I suggested removing the unit from the a/c to isolate the issue and John, the tech, agreed and sent the wiring diagram so that I could run it in reverse. Sure enough, the a/c compressor worked after it's removal and the camping trip was saved.
So, I purchased another SoftStartRV. Why? The rapid response - service! New unit is installed and the a/c is again able to be operated on a 2000w inverter.