Having owned several Lib/Gnu boards with MTX, like a T. Rice, a couple TRS's, and several Rider's Choices, they are definitely the real deal. However, if I were to get a Mervin board now, the only ones I'd be interested in for the riding you're describing, are the T.Rice b/c of their C2BTX and the Jamie Lynn BTX b/c its magnetraction is much more mellow.
17 Capita Kazu Kokubo Pro . 17 Korua Apollo . 17 Lib x Lost Mayhem Short Fat . 16 Never Summer Swift . 14 TJ Brand Retro Fish
17 Burton Malavita Wing . 16 Burton Genesis X
16 Flow Talon