I own a Magpul Masada but not a TM M14.
Out of the box the Masada hop was absolutely terrible. I could just barely lift a 0.25g BB. This is because of ARES crappy hop design with this quick change barrel malarky. When you get it, take the hop unit out, get one of the stiffer buckings (Proprietary parts fml) and disassemble the hop unit. Then put the barrel back into the hop unit section, THEN put the bucking in, just make sure not to remove the barrel after as this will damage the bucking.
I was then over-hopping 0.3's with no hop applied. (I also put a madbull blue in at this point)
Trim some off of the wheel, and it's lifting 0.25's perfect with no hop applied.
Other than that, great externals, nice feel to it, great rifle all around, no problems so far apart from a lock up issue which was my fault, the quick change spring is a nice feature too and you can have everything in pieces in 2 minutes with the body pins etc.
Great rifle, feels so nice on a 7.4 and the response is immediate with the microswitch.
Even though it's ARES internals, they're really good, only ARES good I'd recommend.