Attack man offers some quality input to you, Shift08. I'll give you my opinion though too. I have an 09 Nytro xtx and I am a trail rider 95% of the time. Quite frankly, I'm just not ready to give up the machine yet. It has the attributes of a dirt bike when I feel like catching some air yet it offers a very comfortable ride to protect my aging back. I have not found the sled to be stiff unless I have adjusted the suspension to do so. It will feel top heavy if you are aggressively cornering. I have played with the ski's and carbide set up and have mine dialed in for my style of riding. The tall windshield and side deflectors are necessary for me and with them, I rarely have been cold even in -10 or slightly colder temps. The hand warmers on the newer models are much better than what I have and that, I'm sure, you will appreciate. One design issue I do have with it is the rear exhaust. It will create and collect several pounds of ice in the tunnel.
I differ in my opinion from Attack man perhaps from a riding style preference. The Nytro xtx is my favorite Yamaha sled to date because it is not a "sit down" style sled. I have logged a few miles on the Vector and Apex as well and they too, are awesome sleds.
I would offer you to ride my sled as long as there is snow. If you would like to ride an Apex, I will offer that to you year round. A buddy of mine stores his at my place.
Now you have two opinions from guys who claim to be "old and crabby".
Happy shopping.