I have a 2016 Yamaha Kodiak 700 that has taken me anywhere with zero problems. It is considered the work machine where the Grizzly is the sportier one.
I am also on the Yamahaowners.com forum and haven't seen any real problem come up with them. There was a problem with the top end when they had Subaru building their 700 engine but they are now producing their own 686cc/700 engine that I haven't heard any bad about. Then there is their 450cc engine, I'm not sure if the Grizzly comes with that option but the Kodiak does.
I am also on the Yamahaowners.com forum and haven't seen any real problem come up with them. There was a problem with the top end when they had Subaru building their 700 engine but they are now producing their own 686cc/700 engine that I haven't heard any bad about. Then there is their 450cc engine, I'm not sure if the Grizzly comes with that option but the Kodiak does.