The only reason why I prefer this gun over the original Shotgun made by Ephi, is because Ephi's shotgun blows you 100 feet in the air and 500 feet back when you get killed by it. It also doesn't spread more the longer the bullets go, making it a cheap "sniper" weapon.
On my "2Fortesque" TDM, I used to have both Ephi's Shotgun and Bushido's Lupara, with the Lupara being for the scout. After a while, I realized that the Shotgun was much more powerful than the Lupara, so I started looking for alternatives.
Then, this gun came, and it was perfect. I can now have some classes' secondary weapon be this, which is perfectly balanced with other guns, and the scout have the advantage (with his "shotgun" being his primary weapon) with the Lupara. Simple as that.
Now, Bushido, if you will only increase the damage, especially the splash damage on your Demoman Grenade Launcher, so that it actually kills people instead of making them fly, that would be great. For now, I have to stick with other, overpowered or just plain not good grenade launcher weapons instead.