It is simple really once you have the first upgrade. You jump over you target and if you think your going to hit them air stomp. If not then just fall(no harm) and kill them the regular way. That is what makes air stomp so useful it is not the attack its the ability to decide in mid air if you should or not. The no fall damage is worth the effort.

Its very situational like many said but it makes you a open target after you land (exposed for around 3 or 4 seconds after you land) but once you get its final upgrade that lets you recover faster its nice for quick kills.

It is simple really once you have the first upgrade. You jump over you target and if you think your going to hit them air stomp. If not then just fall(no harm) and kill them the regular way. That is what makes air stomp so useful it is not the attack its the ability to decide in mid air if you should or not. The no fall damage is worth the effort.

This is actually a good point, I hadn't considered this before. I've developed a knack atm of picking moments while Run n Gunning and getting at least one kill per jump. However, there have been a few situations where I've seen the guy move at the last minute, and missed completely; seeing as I have the option of landing without damage I should probably have just landed normally and shot them lol.

IMO you should be invincible while you're in the animation of hitting the ground.

This. If this was true, it would be much more balanced. But you'd still have the problem of getting shot while you're getting up.

Use it in STEALTH mode

Use it in STEALTH mode

I've noticed a few people saying this, but if you use it on crash site (which is likely to get you the most AS kills), landing in cloak will mean you get killed VERY fast by any stray bullets, or if anyone sees you; plus I would imagine Air stomping while cloaked would lose all your energy.

If you're on crash site, it's best to hit the ground in armour mode. I have no idea if it adds damage, but it means you're more liekly to survive the standup animation. Also, if you don't get any hit warnings after you land, cloak for the rest of the standup animation. At least that way you probably haven't been seen - and won't die instantly.