overall, these are great. fits well, sounds great. however, i think i'm allergic to the silicone ear tips. after one use, the rim of my ear where the ear tips sit is extremely irritated: itchy, red, peeling, etc. i've never had this issue with any ear tips before. i tried all the different sizes that were included thinking it was a fit issue, but every time i wear them, i get the same reaction. are there any alternative ear tips (foam?), etc. seems the fit is proprietary and of course, i can't find any replacements.