I got 3 yrs of extended warranty on mine. Bought May 2017, runs out May 2020. Maybe that's not extended, but it was 3yrs coverage.
It's been to the dealership once in the first 125hrs I've put on it. That was for the 10hr service. Did the 70hr service myself at the beginning of the season. Will be doing the 100hr service myself as well. It's amazingly simple to do. The engine and driveline in these boats is remarkably simple, and can be serviced without special tools for the most part.
The warranty will help if there is catastrophic damage. Several have lost engines when the rear impeller bearing failed (2 that I can think of off hand). Couple folks lost engines to timing chain failures, but those were limited to "older" pre-2016 engines, the chains have been updated since then.
A bigger question is...."How mechanically inclined are you?" Do you have a medium-large socket set in the garage, jack and jackstands, some power tools sitting around? How much work do you do on your car? Change your own oil? If the starter fails on your car, will you replace it yourself or take it to a mechanic.......If you're even a little bit of a "car guy" then these boats will pose little to no problem to you. If you're the kinda guy that takes everything to a mechanic/shop to get addressed, then the warranty might be for you. No harm or foul in either direction, we each have our own inclinations, hobbies, free time, and budget allotments.
For me, as a deep seeded car guy with a monster tool collection..........The warranty has not paid for itself on the boat. It's been dead nuts reliable, with just a few issues here and there that I've been correcting myself along the way (cheese and rice the leaks on this boat are infuriating).
My GM pickup on the other hand, bought a $1,500 warranty on it to cover through 125k miles. It's already paid for itself twice over with minor issues being very expensive fixes (A/C condensor, and touch screen have died). But that machine is SIGNIFICANTLY more complicated than my little AR190.