I don't know about some.............
Say it was like back in the day when the other brands have like a 50% chance of mech box failure...even if you had to replace the entire thing it would still be cheap than all the metal uprades and other accesories that come out of the box with other brands
I would only use TM now for guns like the P90, AUG, FAMAS, Thompson, just basically anything another company doesn't make in full metal or another more realistic material.
I hear CA is coming out with an AUG??or hmm I'm not sure, but if they do it'll be metal