I've been doing some tip rolling lately and I thought I'd share my thoughts.
I will say that I was no fan of Comply tips, as I felt they significantly rolled off the treble in every single IEM I've tried them on. However, trying them on these and the Etymotic ER-4S, the effect is minimized (and nonexistent on the Etys). The narrow bore of these two IEMs aren't as susceptible to the foam covering the soundhole and muffling the sound. I'll just run these down in order:
The Best:
1. Etymotic grey foam tip
Easily the best of the bunch - great fit, flawless isolation, no negative sound impact. These are the best foam tips on the market because Etymotic has a freaking brain and made the rubber channel extend all the way to the end of the foam, hence no foam over the soundhole. Yes, the Ety bore is longer than the 535 bore, but it's not nearly as significant as you'd think. I will be using these exclusively with the 535 from now on, lest they wear out and I run out of spares.
2. Grey silicone stock 535 tip
Decent fit, great sound, fair isolation. Easily my favourite stock tip, and what I would use before I tried the Ety foam tips. The best all-rounder that will never wear out.
The Decent:
3. Comply Tx-100
Great fit and flawless isolation, but a slight softening of the sound. Maybe 15% the effect it has on larger bores. Absolutely no advantage over the Ety tips.
4. Shure yellow foam tip
Almost identical to the Ety tip, just a bit shallower. Extremely itchy, so I won't be using these. Found the foam a little overly soft as well, so they didn't feel firm in my ears. If they don't itch on you and you find them firm enough, they're no worse than the Etys.
Not a fan:
5. Westone grey foam, black sleeve tip
Great fit, great isolation, well behaving foam, quite comfortable. The foam does extend past the bore but it's rigid enough not to interfere with the soundhole - however, to my ear the length of the channel introduced a strange resonance in the midrange. There was almost this "blowing on a beer bottle" thing going on in the background.
6. Shure triple flange
These fit nicely and isolated well, but they introduced some weird wah-pedal-like frequency response. Very unnatural sounding.
Need to revisit:
Shure Olives
Never really spent a lot of time with them. Had difficulty getting the tips off, so I stopped experimenting with them. Recently read about the 'freezing trick' so I can revisit it later.
Westone foam tips
I only tried the black sleeved one. Bought a whole set with different sizes, so I'll see if different sizes get rid of that strange resonance.
Hope this has been helpful.