Honestly, if you’re looking for a real Finnish-style sauna but don't want to spend a fortune, just get the SaunaLife CL4G. I spent months researching kits and almost bought a barrel sauna, but I’m so glad I chose this cube shape.
The heat is just way better because of the flat ceiling and rounded corners. Plus, it actually has multi-level benches. That was a huge selling point for me. In a lot of the cheaper kits, your feet get stuck in the 'cold zone' on the floor, but in this one, you sit high enough to stay warm without scorching your head.
The build quality is solid, too. The outside is thermally modified spruce that has held up great against the weather. The inside benches are thermal aspen, which feels super soft and doesn't burn your skin when you sit down.
It’s pretty compact, fitting easily in our yard, but still roomy enough for 2 or 3 people. I can even lie down on the top bench by myself. For about $8,000 all-in (heater + shipping), it’s the best bang for your buck if you care more about proper sauna physics than just having giant glass walls.