I got the FD-2 about last month. No concerns or issues with my sauna. Likes: heats up fast, lots of mid and far IR due to having both Carbon and ceramic heaters, 360 heater placement - no cold spots, uses SmartLife app for wifi connection, blue tooth for audio and speakers are actually very good, well constructed with lots of certifications and went together w/o issues, I verified that all the wiring is wrapped for low emf/rf - as advertised,there’s an auxiliary outlet that I used to add a RedLight panel which made it very easy to do.
Advice:Red light, like most saunas it is located in the ceiling. Just don’t expect the amount of near IR to be much, which is why I added a panel.
Would have liked the 3 person version, but it didn’t fit in the space I wanted to use. Like all the saunas the two person version is tight if you really want to have two people in it.
No regrets and enjoy it.
Hope this helps you decide.