All the pipe slices are junk these days. Made by accountants.
The ÂŁ3 ones from bes last just as long as kopex/ rothy's monuments and those things they sell in grahams or whatever. Tried them all.
My first set of slices 20 odd years ago lasted me about 3 years (with a few wheels). Now i'm going through 3 - 4 sets a year.
I've just ordered 10 sets (5 x 15 and 5 x 22 for ÂŁ35) of the tornado ones from bes which should last a year or so. (they come with a spare wheel too )
My old freebie plastic pipe cutter will last another 10 years at least for all i use it.