Mf8 v2. The Dayan out of the box is pretty hard to turn, you'll have to loose it a lot, lube it and solve a few times, but it's good after 5 solves. Mf8 is strange, you can get a very very nice minx or a very very sh*t minx.
Mf8 or Dayan. I think ShengShou it's also good, but I've never tried it :)
EDIT: You do not need to mod the Mf8 or the Dayan ( just loose them a lot, lube and some solves on them ) but you should mod the SS.
Problem with my megaminx meffert
on the last days my megaminx meffert's had some problems.
Two sides, the blue one and the white one, don't hold the regulation, and after 20 turns they get too loose.
Have you got any ideas to fix this problems?Or I have to buy a new megaminx?