CEP = best money I've ever spent.
Works far better than my brand new ANR headset, esp. with doors off flight or if the earcups don't seal 100% (e.g. sunglasses)
Don't worry about wearing them all day, the foam plugs come in 3 differents sizes (or get molds made) and are super comfy. It's likely you forgot about them by the time you pull off the brain bucket. Plus they are really simple for DIY installation.