I love them. I use the Muzzy practice heads (I don't shoot field points), they are the same weight and fly exactly the same as the hunting head. No surprises.
Killzones are probably the most accurate broadheads out there but when I needed some ASAP nobody had them in stock so I picked up some wasp jak-hammers and they didn't disappoint at all.
Muzzy Trocar. Shoot really nice while practicing...yet to get a chance to really put them to the test.
I'm a huge swhacker fan, but the rage chisel tips are great too. Great blood trails and pass throughs with both.
I don't like to change what works for me but in 2012 my son gave me some Killzones to try out. I've killed several deer and antelope with them and they worked great. I recently ran out of them and have about 20 Muzzy's so I'm going back to them (used them for years with no complaints). I shoot the 4 blade 100 gr and my hunting buddy has shot the three blade 100's for years. He refused to change. :D