We chose to have the Plunge contractor build our unit, which was 95% well done. The delivery and construction scheduled a few days apart. No problem. The only issue we've run into in terms of operation is the interior light. I haven't been able to get it synced and with the remote and app. The app is a bit slower than the Plunge All-In tub, but it works well and allows me to pre-heat the sauna from anywhere.
The interior is spacious and comfortable. I find the best position for my height (6'5") is the lay against the side wall and kick my feet out across the bench. I'm loving the look of the unit and the health benefits of the sweat!