The price sounds decent, I picked up a 08 with 560 miles on it for $5800 last year. Luckydawg pretty much nailed it on the 08:
The Maverick track is terrible, the paddles tend to fold over
The rear suspension is poor in design, trenches easily and doesn't transfer power very well
The front end handling is pretty bad
The running boards are wide and ungainly and hold snow
It's heavy, it weighs a lot, and it's not light either. You may think this isn't too much to worry about, but if you are riding in the mountains in deep snow it makes a difference, a huge heavy difference.
The Genesis engine is bombproof, it's a great engine, gets good gas mileage, and is OK in power. It fits into the 600cc two stroke classes, so a little underpowered compared to the top mountain two strokes. Boost is the way to go with this sled. Yamaha is built well and very reliable, but I find that a slim peg to hang your hat on. The 08 Nytros seem to be the most problematic and need more help than newer models. Yamaha has been tweaking things and making the sled better and better. This year they've even offered a semi-factory boost.
I ended up trading my Nytro. I was looking at putting a lot of money into it to get it where I wanted. The sled I traded it for was brand new with warranty and already where I wanted it. I was looking at nearly $9K into the Nytro, I traded it and half the cash to get a brand new two stroker. So far I am happy with my decision. If Yamaha comes out with a factory 4 stroke boosted sled that handles like my current sled does and weighs close, I'll be back to blue.