We like this sauna very much.
When it arrived, we had to replace a part and was able to receive it very quickly. The customer service was perfect.
We had a contractor who was also remodeling our bathroom set up the sauna, and it seemed easy. It took him an hour, or an hour and a half to complete.
The backrests are good, and I really like the Bluetooth compatibility to listen to music, podcasts, or anything else while you're in the sauna.
It takes about 30mins to heat up, which I assume is due to the standard outlet plug-in, so I give this 4 out 5 stars.