MOS air stealth units* when/how to use?

Yo, homo's.. oops I mean homies, lol. So I've read a bunch of the forums regarding the GW vs. MOS strategy and "learsters" MOS demonstration. I've been using GW quite a bit, and Im good at it but I've considered maybe using MOS as well depending on the game type. Anyway so with all this reading I've done, I saw a lot about subs and marines obviously, but I don't think I saw one mention of using air stealth units. I'm curious about where/when one uses air stealth?

If I have the money, I will mix them in with various strats as my surprise unit. Keeps opponents guessing, what they see isn't all you have. Plus they are unlikely to be tb'd.

Haven't played much MOS, but I would use them to support the attack by making use of their range. Breaking walls and wf, reinforcing an attack from distance, if I need something fast, etc. Depends on the situation.

Gotcha thanks homie