They isolate well, and do indeed narrow the soundstage of my se110s. Unfortunately, they look very strange and reach into parts of my ear that I was not aware existed. Not exactly uncomfortable, just unusual. I'm going to stick to the foam tips for now, but when they wear out, these will do.

I hated these things.

1. They hurt your ears, leaving them sore after only 30 minutes of listening time.

2. They are frustatingly difficult to insert into your ears. I suggest either a lubricant or some romance to get the ears "in the mood" first. Or you can just skip this purchase altogether.

3. They are not really necessary since the other "buds" do just fine for most activities.

They are difficult to get into your ear, but once there they will not fall out. They are perfect at blocking all sound and I found them to be very comfortable.

Only complaint, they start to turn yellow from ear wax, so make sure to wash them every couple of weeks or once a month.

Ordered these sleeves to use with Westone UM1 headphones and Sansa Fuze MP3 player. Before these arrived I used to use Comply tips, which came with Westones. They were never satisfactory for me: not easy to put in and required some serious EQ to sound right, which obviously had an effect on the sound quality

On the contrary these triple flange sleeves are simply amazing: very easy to put, stay in place and the sound is dead on with Fuze + UM1s. No EQing is needed any longer and this portable combo sounds almost as my reference desktop setup: Philips Aurilium + Audiotecnica ATH ES7

And one more thing - I did bi flange mod to them, which did not affect the sound, but is much more comfortable

I just tried them with my E3c's and was surprised by how bad the sound was. Lost all bass -- like listening to my music in a tin can! However, they did stay in my ear better, but who cares?!

--UPDATE--
I've added 2 stars after taking some scissors and cutting off the top flange and shorting the stem at the other end. Seems to fit better and I got some of the bass back.