The biggest selling point is not that it's the only korean style sauna in the area, but that it's probably the cheapest place to stay for a night in the Toronto area, besides sleeping in your car or on the street. $20 for 24 hours. Doesn't get much better than that. You need a car to get here though, although I think you can get here by bus eventually.
Unfortunately, you'll be sleeping on a floor mat or a couch. The sauna rooms with the different temperatures and interior walls was interesting, but not that appealing to me.
The little convenience store style snack bar was a bit sad looking. I've been to saunas in Korea, and they generally had way more stuff to eat and play with. Still for $20, it's good enough.
I was a bit worried about the cleanliness and level of hygiene. The ground of the shower room had a weird brownish discoloration that didn't wash off. The water in the dipping pools wasn't being circulated, so I had no idea if it was clean or not. I was hoping for a more traditional shower area with stools and a variety of sprays and soaps but this was just a very basic shower.
The floor mats are quite dirty. I don't think they get cleaned often. You might want to wipe down everything yourself before using it.