After years of abusing my ears with no protection or simple foam plugs, I got a set of ER 20's from Mike Dimin. They've been real life savers on several occasions and I wear them regularly at my gigs and loud rehearsals. However, there are times when I feel like I don't need quite as much attenuation (quieter gigs) and the earWear 12dB ear plugs caught my eye. They look very similiar to the ER 20s and claim to be hi fi. Anybody have any experience with these? How do they compare?