I really liked LFE's idea to sipe these turf tires, but couldn't justify the $80 on the grooving tool. Since I was using my circular saw to cut up some deck boards, I decided to give it a try on the tires instead of the grooving tool. The saw blade is relatively narrow at only 1/8", and it would be easy to control the depth with the fence which I set at 5/16".
It actually was very easy to do. I cut the same pattern as LFE and didn't get too hung up on exact placement. I cut 3-4 rows on each side and rolled the tractor forward a foot or so and kept going until I made it all the way around. I wore a dust mask and used my leaf blower to clean up the debris afterwards. Maybe 45 minutes total? It literally didn't effect the carbide saw blade and the only time I had any blue smoke was if I side loaded the saw a little bit.
If I did it again I would jack up the tractor to rotate the tires and set the saw a little deeper. Maybe 3/8"? Not sure the outer row is needed?
Driving on this light snow in the pic it seemed to make a big difference compared to the stock tire. I don't expect it will make much difference in deep snow. Sorry, no analytical data or side by side comparison, you'll just have to take my word for it.