I picked up a pair a couple of months ago, but haven't used them live.
Using 2 on a Tbar, one for each mic, I found it hard to get an exact angle (eg, 110deg ORTF) since there's a bit of play on top.
Eg, get the mics to the desired angle, but on release they'd move. Not good.
I then tried putting a single mount on the top of my light stand, then attached a Tbar w/ 2 mics (also KM184s) to it. Too much weight for the mount to handle. I noticed a LOT of wobble.
fwiw
/Ken