Quoted:
Peltor Tac 6, electronic and work pretty well. No experience with others.
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I have the same, and i find that the slimmer profile than the 7's makes them easier to use with long guns.
The sound cuts out completely when there is a loud noise, so it can make it difficult to communicate on the range sometimes.
The COMTAC's have much better sound quality and I am told that they don't cut out completely when people are shooting. I did notice that wearing 6's in the field while hunting I had to get used to the loud crashes everytime I took a step. They make an armadillo crashing through the brush sound like a bull elephant.
Some people advocate having these in your safe room for home defense so, God forbid, if you had to open up with a long gun like a shorty AR you could still have some hearing left afterwards. Which would make it easier to communicate with your spouse, reponding emergency personnel, etc. Plus you have "superhuman hearing" while you wear them.