Longevity of Dundalk Liesurecraft ‘Outdoor Cabin Sauna’ model?

Who has this sauna?

I’m in Ontario Canada and I’ve shortlisted this sauna brand and model at 5’x7’.

Since this is a kit, isn’t insulated, and the distributor doesn’t have a demo for me to check out, the I’m hoping someone here has this version and can review how it’s aged over the years.

Any spaces or gaps emerge with time? Worth the price? Does it get hot enough without insulation? Has it held up in our hot summers and cold winters, especially the roof? Any modifications?