Only downfalls I have encountered are that its not as fast as the RZR XP 4 (obviously), and there is significant gear noise in the passenger compartment especially with a roof of any kind (I didnt really notice the noise as an overt problem, until adding the roof. As my rhinos have all been really loud inside too).
Besides that, great smooth ride, handles well for what it is, very roomy, comfy stock seats, huge back seat, good torque, enough power to trail ride even with 4 adults + gear. New motor and clutch changes are great.