Hello guys! My name is Sergei. I'm from SnowDog company and I want to address some qustions posted here about the machines.
First off, very slow. Second, rough ride and very uncomfortable, since you sit in a sleigh with no suspension. Third, most of snowmobile manoeuvering off trail is done with body language. You couldn't lean the snow dog at all. Fourth, when you want traction to pull something, you actually benefit from having a bit of weight (the rider) over the machine. Since you are already towing the rider, that takes away from what you can tow. Get into a bit of powder and I feel like the machine will spin and struggle a bit even with just a rider in the sleigh. Just not heavy enough. An almost 800 pound skandic with a rider will tow 1000 lbs, and even that needs to be on a trail. I feel like their 600 lb tow rating is a bit liberal just given the weight of the machine alone.
When a sled accelerates, it transfers weight onto the track. Same in powder. More of a performance thing, but not happening with the snow dog.
I could be totally wrong, and likely am on a few points, but that is my take on it at a glance. It could have its uses in certain situations, but like I said, not a use that can't be replicated with the most basic of sleds. And sleds with a dealer network, and readily available parts. I'd look into a small trailer and a 1990-2000 era tundra or even bravo at less than the price point of a snowdog.
SnowDog is about combining:
1. lesser cost (several times lower than the cost of an average snowmobile)
2. small size (can be transported in a car),
3. agility (can go where snowmobile can't)
4. year-round use (not just for snow/ice, it'll ride on grass, marshland etc.)
with
5. speed (up to 20 mph),
6. power (pulls up to 600 lbs, the number is real - just depends on the land surface)
7. ability to overcome rough terrain.
You are correct, of course, that the latter three points aren't as strong as in case of a full blown snowmobile. The idea is that, in many situations, the combination of 1, 2, 3 and 4 is more important. It's not "snowmobile's obsolete", but rather "different tools for different circumstances" logic.
Ride comfort generally depends on the land surface. Also, rides become more comfortable since we have developed soft seat, and introduced tubeless low pressure tires for shock absorption.
Finally, now SnowDog has a dealer network in the US and Canada, so parts/maintenance won't be a problem at all.
You can ask me any specific questions about these mechanical fellas.
Good luck!