It depends on your language that you can speak too.
I've been the a few that the language barrier is too great that it kind of detracts from the whole experience.
If you're looking for understanding, and you don't know Mandarin/Korean/Japanese, I would shy away from most SPs that are reviewed here (K604, Foxy, Icon, XDS, etc.)
Since it's your first time, I'd follow Jimmy's advice and go for 45/60mins cause you'll probably get performance anxiety and not start in the first 10-15mins anyhow with shower and all.
You don't want to rush the next 15-20mins like I've had the mistake to try in the past cause I was watching my wallet.
Skip the MSOG and save that add-on cost for a 2nd session with another SP.