Ice spikers are excellent, but you need to watch out for the type of stud used.
I had some 26 ers which had the good concaved tungsten tips. All good.
Some years later I got some 29 ers from CRC as they were on offer. The studs were the poor relation: still tungsten but pointed, not concaved. These are highly undesirable and I had to go to further expense and effort to switch every stud to the concaved type.
Sadly, after doing that I invested in some Johnny 5's 26x 5" for the far bike. ....completely studded with the good studs, so the Ice Spikers are hung up virtually unused