I think it would be much better if you started falling straight down when you use it, rather than doing a little double jump and then falling. Granted that extra jump help gets you some distance, but your accuracy suffers.
They also need to correct the damage on it... sometimes it connects, sometimes it doesn't.
Recently my friend was watching me and I stomped between two people. One guy I was pretty much touching, but he was on the staircase right next to where I landed, and he didn't get touched. The other guy was ~7 feet away and I killed him. We both noticed it was very odd, but still cool that I got one

I think the damage should be more of a bubble area based damage, rather than a flat plane based damage.
Yeah, it's not very realistic, but hell, stomping the ground and killing people isn't very realistic to begin with lol.