Ditto what Rich said. I've got Moons on my pickup -- and the screw-on type wouldn't stay put. They'd loosen just enough that I'd hear click-click, then in the mirror I'd see a disc pulling out to pass me. I kept tightening them -- that didn't help enough, either.
The button-type I've got on the pickup now stayed quiet -- and stayed on -- all last summer without a whimper. I can check air pressure easier, too -- just like he said. Pretty soon it'll be warm up here, the salt on the roads and the snow in the driveways will be gone, and I can put the Moons back on the truck. Of course there's one potential hassle -- when I had the winter tires put on the rims they bent the mounting tabs in a bit -- now I've gotta figure out how much to pull them out before I can make the buttons fit. Life is rough in the Great White North.
We went snowshoeing off our deck yesterday. I betcha not many of you can say that (yeah, I know, you don't want to be able to say that, either...).