I'm almost 6' 2" and I chose a Medium. I test rode a Medium and a Large back to back and went with the smaller frame. Loving it!
I ride a Nomad as my XC/AM bike and didn't even have to think when I ordered it - definitely went with a Large.
If I were you, I'd try to test ride it first. Do NOT TRY to fit it like an XC/AM bike. The riding position is not the same, it's a completely different toy!
To be honest, without test riding it, you might be happier on a Small.