I test drove two Sidewinders today at a Yamaha demo day. The first was a 50th Anniversary RX-TX, the 129" track version. The ride was on a groomed trail, mostly through fields, but also through some bush. Trail conditions I would describe as fairly good - no bare spots, good pack, but packed quite hard.
The first thing I noticed was the jittery front skis - I didn't feel that the tracking was very good at all. I can't understand how Yamaha can make such a monster sled, but not put skis on it to keep the front end tracking properly. I did push the throttle down on a few occasions, and felt the tremendous rush of acceleration from the turbo motor.
Halfway through the trail, I switched to a Sidwinder 144" track. This sled had Snowtracker rails and carbides, and deeper lugs on the track in the back. This made quite a bit of difference to the performance of the sled - the jittery ski problem was greatly reduced, so I could focus more on feeling the power. The only problem I had was the continual fogging of my windshield (totally not prepared), so I had to pare things back a bit with my visor open.
The trail sections were a bit short, and the guide who took me through slowed down in the trail sections, so I couldn't really go through as quickly as I wanted to. However, I did think that the throttle is too twitchy for going through trails - the sled seems to go from a low speed to a blistering speed in too small of a throttle move - I think this must be a consequence of the sled's massive power. Despite being the most powerful sled engine in the world, I'm just not convinced that it's the best for trail riding. I'm thinking that I should demo some other sleds that have less power, and maybe a less responsive throttle - I just don't need to go from 35 mph to 80 mph instantly. I would like more usable, linear acceleration in that range for trail riding.
As amazing as this sled is, I can't understand why it would have inadequate skis on it. If Yamaha has thoroughly tested this sled, I'd be amazed. It's difficult to put your money down on a sled that needs a new essential part right off the bat. The best analogy I can think of right now is that it's like putting wooden wheels on a Formula One car.
Even though the Yamaha looks exceptionally well made, I think I'd be better off with a less potent engine, less weight up front, and better tracking from the skis. It'd also be nice to have something light enough to jump small stuff. I'm sure the Sidewinder jumps, but all of that power makes me think that a little too much throttle will get me into some serious trouble.
The best analogy I can make comes from the motorcycle world - it's easier (and more fun) to ride a slow bike fast than a fast bike slow....