I’ve got one and for the prices they are flogging them off atm, I would highly recommend you buy one.
They climb brilliantly and equally fly downhill, really plush and feel like 150 rear travel. It’s the best trail centre bike I’ve ever had and actually got a few podiums at Gravity Enduro races last year too on it.
Sizing wise, yes there is a bit of a problem here as they are actually oddly sized!
I’m 5′ 7″ and all my bikes have always been a medium, but the Ghost LT is a small and sizes up spot on, (except for the stem, I changed the 50mm for a 75mm). Also I have to have the dropper post fully inserted for my leg length @ 30″, so I would say the medium is right for you.