As far as "how long do they last?" A hell of a long time being that they are for snow which basically has little to no wear on the tire.
I like the look of those "Pro-Wedge" tires, I'm sure they are pretty good in the snow.
My favorite tires are "4 snows" - only available in 22's (with my rim size) but I have seen a 200X run circles around me (Louis Mielke) compared to the studded "Realtor" tires I had. And that was in at least a foot of snow or more; That experience made me buy a set last spring and they'll be on my 350X the next snow storm.....
Aggressive mud tires will not perform as well as these, mud tires dig down and clear out the mud with wheel spin while pushing ahead.
These 4 snows tires with a rounded profile without super deep lugs seem to float above the snow and push forwards very well before they dig down.
The "4 snows" were the best tires I've ever seen perform in the snow; Thats the best advice I can offer.......
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country