What I've been able to gather about the Push kit:
- Low boost and pretty much as turn key as you can get on a boosted sled.
- The Nytro engine accepts boost well and engine life isn't an issue. If the engine life is less than natural aspiration, it still has far more longevity than any Ski-Doo 2 stroke. 10,000 miles plus should be expected.
- Feels like more than 180 h.p.
- Haven't heard or read any complaints about the Push 180 kit. The only problem I have heard is that once you have 180 h.p., you tend to want more. Boost tends to be addictive.
If it were me, I'd be torn between a Nytro and the new Viper. The Viper should be lighter with better ergonomics/handling, but I don't like the idea of buying a sled in the first few years of production. Let them work the bugs out of it for a few years.
I haven't heard if they will offer the Viper with a warrantied boost kit and it won't be available with any track longer than 144 from the factory next year. Not the best track length for the steep and deep.
As far as working in the trees goes, the Nytro engine has tons of grunt down low, so getting power down to the track before the turbo spools up isn't an issue.