PTS Weapons Glow Up

I have seen a lot of people talking about the changes to popular weapons, but I was curious what unused weapons are particularly fun or weird now on the PTS?

So far the Pyrolyzer has been the one that really surprised me. The bloody mess effect didn't sound like much, but it is remarkably fun and cripples groups of enemies with each explosion for some reason. So I am just wondering what other little used or odd weapons have had surprising upgrades?