I liked the mh1c tips on the BE's, but I got mocked for using them, so I switched back to the blue stock tips
Seriously, the mh1c tips do tend to increase the bass somewhat, but also make the bass more congested. I didn't mind it though, but after I switched back to the blue stock tips, I did realize that the blue stock tips are better in that the sound is more open and refined.
What I have been trying lately though are the auvio green tips. These have a fairly wide bore, and I was afraid that they might result in the treble getting too harsh or sibilant for me. But that didn't happen, and I am really enjoying them. The bass is lessened a bit from the blue stock tips, and the sound opens up even more. I'm not sure I'll be sticking with them in favor of the blue stock tips, but I am enjoying them.