[Closed] Cannondale beast of the east sizing?

Hi all - quite fancy one of these (on a complete whim) & wondering how they size up, i'm 5'7" with a 30" inseam and usually either go with a small or medium mtb (depending on the sizing) and a 52/53cm flavour road bike, last hardtail I had was an old Chameleon in medium, but that sized up more like a small - anyone have one of the Cannondales to get an idea on sizing? My instinct tells me i'd need a small however an real world experience would be handy - obviously a ride on one would tell me but i'd be buying online.

Cheers!
John