I just spent the evening at TTAC3 running the DD's all night. They work. People freak because they think a grenade is in coming. The bang is loud enough to just break concentration...honestly the bang of throwing against the plywood walls is pretty distracting as well.
Pure simplicity in operation. Really fast to reset and get it back into your banger pouch.
Don't mix them up with ones filled with BBs...it'll ruin your entry...
I held off buying the Tornados and was considering the MB distraction grenade...but when these things came out it clinched it.
Great for indoors and breaches. With practice, your guys can enter a room just as it's going off...pretty sweet.