Have lots of MF and just bought the carpro merino wool. Wow! Love that wool mitt on upper and flat panels. Glides over paint and won't scratch even soft paint. Use AG MF mitts for lower and bumpers. (Also use MM mitts too, and those are great too).
MF. Use once throw in wash with towels. So easy and painless. I have the wookie fist which is incredible, but needs a lot of attention or else hairs matte and it can rot.
While I'd have to admit, wool mitts are uber sexy, what with the way they glide across paint...... but OMG are they are bunch of trouble to keep 'happy'. And yes, I have one too (or at least the half mitt version that doesn't soak up half a gallon of soap every time you 'dip it'. Everyone that has that "favorite" vehicle should have one, but for the most part half a dozen good MF mitts are much easier to deal with. Start each season with new mitts, after a few uses they end up getting used lower and lower on panels, till the point where they do wheels and rocker panels.