I've got a set of the Walker's electric in the ear ($120 ish) I know Peltor has something similar, but at $300+ it was out of my price range.
The sound (speech) on them is alright, not as good the Howard Leight muffs I also use. Time will tell how they hold up to sweat and rain, but so far so good.
They use hearing aid type batteries, so once exposed to air, they start dieing....even if the plugs are off, you are going to get 48-72 hours of use before needing new batteries. You can buy 60 Batts for like $18 off of eBay, so I keep a couple of packs in my shooting bag.
Since they fit in your ear, your options for using in ear commo are limited/non existent that I'm aware of. If you want to run comms, probably be better to use over the ear.