They are a MASSIVE improvement over the previous supplied "grey flex tips" which produce a lot of siblance with almost any ear.
But they are not perfect. It is nice trade-off between comply/olive/foam tips which eliminate 100% of any siblance and the previous supplied silicone tips (grey flex or bi-tri-flange)
Comply Tips: Zero siblance but somewhat rolled off highs. Great preservation of soundstage. Terrific midrange and bass.
"Star" tips: Exceptional fit almost guaranteed due to patented flex striations on the flanges. Eliminates 65-70% of siblance caused by normal disfit of old style silicone tips.
UM56 Custom Tips: Zero siblance but with better overall clarity. A great feat! But sound is aggressive and forward. Can sound "peaky" at times.
Edited by Spyro - 1/6/13 at 9:04am