Hey caspian, i just picked one up about a month ago, and absolutely love it. The externals are definately the nicest part about it. Before even gaming mine, i did take it to my guntech however and get him to overhaul the internals.
So about 450 for the masada, and another 150 into internals (not totally neccessary, but i was pretty picky about what i wanted)
It feels great, shoulders great, I like the balance of it. We now have 3 of them on the team. One of my guys got it in tan, and i got mine in black, we swapped some parts to make them a bit more unique.
http://mb-airsoft.com/forum/picture....&pictureid=212
Personally Im really happy with it, with the money i saved in the purchase cost, i was able to upgrade the internals to outperform the PTS version, and buy some nice shiny optics for it.