kill flash filter pro vs. con

I just wanted to see if anyone had ever used a kill flash and is it worth the money to get one. They are not expensive but 20 bucks will get me a couple of boxes of ammo. Filter or no?

I had one and didn't like it on a 1x optic. The honeycomb was slightly visible and reduced clarity. I looked through a magnified optic with one and it wasn't as bad. If you are going into a situation where the glare from the glass might give away your position, then it could be helpful.

FYI here's a .05 kill flash.

I used to have a buddy who could get his hands on some broken Mass Air Flow Sensors off of cars he worked on. Instead of trashing them he kept the honeycomb "grills" out of them for me. They are made of thin Al and I cut them out with a razor blade, shot them with matte black paint and pressed them into the butler creek covers I have on my scopes.

works perfect.

couple images http://images.whisystems.com/smartpages/partinfo_resize/DUS/213-3460.jpg
http://i00.i.aliimg.com/photo/v3/323683564/Mass_Air_Flow_Meter_MAF_Sensor_Volvo.jpg

I use one on my sniper and it is good for me. Reason is the you won´t get any disturbing light in it and if it rains, the lense is free of waterdrops. So i got nothing bad to say on it. But i don´t use the the extra fine ones, they gave a foggy look.