John
Not to be a skeptic here but I would like to see some close up photos of the chains where they pivot as they go around the tire. I'm sure with 700 hours there would have to be some wear. The amount would factor largely on where and when the tracks were used. In snow they would last a long time and in beach sand the pivot wear would be much greater. The pads could alway be built up if needed, so that would concern me less. My experience with Loeguring and Tracks Plus is that somewhere between 50 and 100 hours of operation, you will need to shorten the track, as the pivots continually wear..
I sold a set of traction tracks to a fellow with a 553 because we did not have any that small, I still had them built with the 7/16 chain. I have not heard from him lately but would assume they are still going on that small machine. He was a farmer and cowsh!t would be easy on the pivot points too.
There have been those who laugh at them and others that are very happy someone builds a inexpensive product. There is no doubt they work. And it depends alot on how they are used. As ASV put it to me about there rubber track life, "if your application is hard on tires, you will be hard on tracks to"
If I was getting a set of chain tracks for a machine that large, I'd be going as heavy duty as possible. Another thing with chains is you can't adjust the chain in 1" increments. (perhaps you could find a couple different length shackles) so it may be harder to keep the the ideal tension. Too loose and your tires spin inside them and to tight is tough on bearings and the track pivots. Some people vary there tire pressure and that makes a difference with most tires.
The other thing to me is being freight is a large portion or the cost being your in AK, I would lean towards something that would last well. But of course the purchase has to fit you budget and needs, not mine.
Have a great day
Ken