I will say I sure do love my 4 stroke... Apex that is. I have yet to ride my Nytro XTX. But I'm still riding the older 4 strokers, none of this Viper thing. I honestly think the whole Viper deal is bittersweet.
Honestly I believe both Yamaha and Arctic Cat needed something like this. Do I agree with it completely, no. But when you have an Arctic Cat guy that was hoping they would have gotten Yamaha clutches on everything, you know even the Cat guys aren't completely happy. Me personally, I think Cat does have a better chassis, stock skid especially... but for overall durability and longevity no, IMO.
With that said I see Yamaha and Arctic Cat both learning something from each other. Come 2018 (Yamaha's 50th Anniversary) I think (and hope) they will be back on seperate paths.