No I haven't, and I probably never will. They are to low and dead sounding for my liking, luckily they are incredibly durable. The thing with GC though is that the sales people are told to push certain products that the manufacturers want to sell. Sadly, the Emp X is one of those things
They try to sell me one everytime I go looking for a snare head. I do know that if you crank the living crap out of it it sounds pretty decent though.
But I'm just a CS guy lol