Going from 26" bike I  was worried that I would never get a 29 er around a hairpin turn but that was just not the case, even the large size I demoed was plenty agile albeit too long (5' 8") but  the medium was just right ... all i can say is try one

I found the braking/shifting/ suspension/ geometry was next generation and worth the upgrade altho I probably could have bought a cheaper " modern bike "

I managed to get 500$ for the old Cannondale Prophet at the swap and the bike store owner figured that was on the high side, you sure don't get much for a used FS trail bike