I've got 2,500 miles on my first Mefo SE rear and I'm pretty happy with it although it does seem to be wearing quicker than the scorpion. I will say when it was a fresh new tire pavement was a little squirrelly on a a good lean, and spun the rear a couple times on wet pavement (I think that's to be expected though with a nobbie 50/50). Now that it's worn a bit it handles fantastically on pavement and still rips off-road. I'm no expert and have never done Baja but I think you'll be happy with a fresh set of the Mefo SE's.
2010 KTM 990 Adventure
1978 Harley FX cut down