I bought this cup holder because my older tractor didn't come with one. I thought a magnetic cup holder with thermal liner was a cool idea. The biggest problem I had with it is that the magnet was not strong enough to keep it on the tractor when riding over bumps.
So I took a bolt, washer, nut, and bolted it down to the frame. The cup holder comes with a hole at the bottom already, so installation was a snap. Once bolted, the cup holder never fell off the tractor body.
Though I like the thermal liner in that it keeps drinks cold like soda cans or beer coolers, it was however too small in diameter to accept soda or juice bottles. I guess there is really no way around this, as the liner has to be made small enough to grip a can.
I like the cup holder and all, but being limited to what kind of drink I can keep in there, and the fact that I had to bolt it onto the tractor, does leave much to be desired. 3 out of 5.