I haven't done strict A/B noise testing to see whether Gliders beat Olives or vice-versa. But I own both and I think bangraman's right, the isolation's roughly comparable. For me that's quite isolating indeed, but I'm sure people's experiences vary. I never found Ety's cylindrical foamies even slightly tolerable, so I am taking on faith the assertions of bangraman (and I think quite a few others over time) that they are the most noise-isolating of the options.
FWIW I'm currently experimenting with
Klipsch silicone tips for my hf2. VERY easy in/out. Good comfort. Isolation is less than with tri-flanges but may be sufficient for my purposes (haven't stress-tested them yet to be sure). They are pretty stretchy and so I suspect they may not be long-lasting enough to become a regular habit for me but it's too soon to tell.
@iponderous, bangraman and I have occasionally participated in the same threads here and exchanged remarks (though he is several ranks above me in equipment and experience and, I suspect, discernment), but our, ah, typists have never met outside these forums.