My ACS sleeves turned up in the post today. bloody hell, its like having a new set of earphones
the ie80's are a good starting point, but with the custom molds they're definitely transformed into something special, the bass has been tightened up nicely, something which if you didn't get the seal right could be a bit bloomy, and I'm hearing background details I didn't notice before. The fit is absolutely perfect too, obviously.
Also, I'm able to listen at a much lower volume, which is a good thing.
not cheap at £120 but if you've got a set of the iem's they do sleeves for, I'd recommend it whole heartedly :^