Yes i went down to 27.5 its worked well bb height is the same give or take a mm the ha is about 0.8dg slacker now 65.4 in low, i had to buy a 20mmx110 front as the axle is 20mm also i need a hope steerer reducer £10 as the steerer come standard 1 1/8.
Mine is a large, i’ve put a fox dpx2 on which was very good and now have the dhx2 which is amazing as i do a lot of dh stuff and very rough natural rocky stuff. If i was just doing single track and trail centres i’d go for the dpx2.
Not tried them on a medium