Yup. Got them done for my Shure 530s.
They improved the sound and comfort loads for me as even with the large olives, I wasn't getting a 100% seal all of the time.
Take some getting used to when first inserting them, but after a while you get used to the routine. (It's a insert, turn, and lock method)
You just need to ensure you get really good impressions done.
Treacherous path you're walking though as after I got these, I ended up getting a pair of JH Audio full customs followed by a portable amp for my ipod......