Why get a tec?
Because the anti's hate 'em. Listed in the '94 ban by name due to it's futuristic appearance.
Personbally, I have a tec22; cheaper to shoot the the tec9, jams far less, and uses 10/22 mags.
Cheaply made, not accurate. No good for competition, no good for self defense. But I shoot it for fun, and it works at at that.
Parts and accessories are impossible to find tho, and the firing pins are known to break.
An MPA30 (mac clone)will set you back a bit more, uses cheap sten mags, very solidly made, almost 10lb (well, no, but feels like it) -- or vector arms sells uzi's for around $600 (out of stock when i last looked).
Sometimes what you want to shoot isn't the "grown up choice". I have the tec, mpa30, and uzi. and drive a sports car. Like I tell my wife, no, I won't grow up.
Keith