I have a set of Peltor 6s that went tits up on my after about a year. And I never really got them to fit all that well around my eyewear, either, hence another reason for double ears on my range days. The Comtac II is, minus the mic boom, double NATO radio inputs, etc., comparable in price to the MSA Sordin Supreme Pro-X. I think the NR rating on mine is slightly better, but not by much.
Personally, I like having the electronic ears to help amplify range commands, as I sometime shoot on the far away side of my local range and it can be a pain to hear there. It's also an advantage when I shoot competitively, as some ROs can be dicks if you misunderstand something. One near disqualification taught me that pretty quickly. I also like that I can wear my Comtac IIs under my helmet, less for professional reasons now that I'm out. But I still shoot the occasional competition that requires armor, helmet and other gear, so it's nice to have. Plus, I didn't have to pay for them.
One of the guys I shoot with regularly has a pair of the MSA Sordin Supreme Pro-Xs, and he loves them to death. He uses them at work, too, by plugging them into ICS when he's doing HRST stuff, which lets him not have to worry about swapping his kevlar for an ICS cranial.