A lot of new generation tires come siped so I believe there is some value in it…but I probably would not suggest doing it yourself…tire fucks up going down the highway and could cost a lot more than what ever the cost you saved by doing it yourself…
I used to get all my new tires siped, that includes truck, car and trailers. I think it makes a big difference in traction on ice and wet pavement and adds life to tires.
I have always had the tire shop use their siping machine to do it.
in july when it is about 100 and sticky as hell grinding the tires was always a fun job. We made a stand with a motor on it to turn the tire which made it a little better than complete suck
I used to years back on new sets and got a lot more life out of them, plus the added traction was worth the few bucks to do, i have never done it to used tires but think it would be of some benefit if done early enough in the tires wear life.
Had a set of 35" Hankook Dynapro MT's on my old pickup, sucked really bad on ice so I got an iron and siped them myself, total pita but night and day on ice and snow. Pretty sure mine is an Ideal and was around 100$, worked good on atv/ranger tires for early ice as well.