Hardest mechs to master were those 3 quickdraws, that took ages... that damn death can.
Cicadas on the other hand were easy going, i even bought a 3C (as fourth bonuscada) just for fun and dakka and guess what, i never mastered a mech that fast without premium.
Oh and btw, "mastered" means you unlock that module slot, not unlocking those 4 "elite" perks, that would be "elited"

Edited by 627, 26 September 2013 - 10:49 PM.