I've done it last year, everyday for 2 months. Holy toledo, be prepared to be soaking in your sweat afterwards. The session is an hour and a half. It is hot as hell in there. The first time I went, I kept thinking "WTF was I thinking coming here? F#$%!" Afterwards, my entire body ached sooo bad. But each session gets easier and instead of feeling sore afterwards, I felt amazing! Hated it at first but stuck to it and after a few sessions, I loved it. Too bad the place was an hour's drive away and a bit pricey or else I would still be going everyday.
I recommend giving it a few tries. Most places have a huge discount for new members.