For how small and heavy MAC's are for their size, as well as the blistering fire rate, they are pretty inaccurate for their lack of controllability. I'm not sure about reliability though.
The MAC does share a lot of similarities with the Uzi. Compact, box-tube, open-bolt submachine gun, made from stamped sheet metal. MACs are significantly simpler and cheaper though, which, again, if we're talking about legally obtaining them, isn't saying much.
That's not a Tec-9. That's some variation of MAC. Though, if we're being honest, that thing is probably an airsoft gun, considering it's incredibly difficult and expensive to get a real one legally.