After many years of snowmobiling I grew to really like the CVT transmissions in them; they worked great with high-performance two-stroke engines. When it came time to purchase a 'quad', I had the choice of 6-speed manual (with auto clutch) or an 'auto', which had a snowmobile-like CVT. I went with the CVT and have run that quad for 20+ years trouble-free; I mainly use it for snowplowing my 300 ft paved driveway and for summer outdoor chores & exploring.
I've never been at a loss for power (500cc single cylinder water cooled 4-stroke) and the CVT auto trans has been wonderful for my usage. The only issue I've ever noticed is an occasional 'chirp' from the belt compartment when under hard acceleration from a stop, not really an issue at all. My transmission does offer some downhill engine braking, although it's never been a requirement with F&R disc brakes.
I consider the CVT to be an ingenious invention, quite reliable and entirely suitable for the applications it's primarily found on, such as off-road utility vehicles.