I just equipped it on Payload. Had a 22 kill, 4 death round by just running straight at Demos and Soldiers and keeping an eye on my metal supply. It kills like Minigun speed at close quarters too and seems to have a much easier connect ration than other players meleeing back at you.
Serious question: how's it do against bullets/pellets? I haven't seen anyone charge a heavy with it yet. And I wonder why those soldiers in the vid don't just switch to shotty close in? It seemed to work for me the one time I thought to do it.
I discovered this today. Rawburt was shorting with a kritz med and causing some problems. Pyro seemed to stop him cold. It actually is a great counter. The Engy will try to get in close and that's just what a pyro wants. It was harder on me to NOT airblast and NOT fast-switch. Just hold M1 and let the engy do all the work.Heavies and Pyros will kill a Short Circuit wielder without much trouble problem.

This isn't the most absurd thing about it.
Its true terror shines when there's a multisentry nest on any given Dustbowl choke point and two shorting engies with dispensers just sitting in front of the sentries. Ubers and Kritz on Soldiers and Demos don't do a damn thing.