I picked up a pack of the Sony Hybrids from Best Buy today, and I have to say: so far I'm really impressed. I found that all four sizes worked well for me sound wise (all had a great seal), but the red/SS (smallest) were just a bit too small for use with the large nozzles on the TripleFi. They fit just fine but are slightly uncomfortable - I could probably wear them for an hour or two but then my ears would need a rest.
The other three sizes all fit fine as well imho, but I ended up settling on the green/M sized tips. I could definitely see putting all four sizes on different earphones, or replacing the mediums with the large/small if needed. But YMMV.
I really like these tips, they provide a deeper insertion compared to the gray silicons that come with the TF10, and are more comfortable to boot. They provide an excellent seal - enough that it creates a bit of a suction, and the very soft outer material will be pulled partially inside out upon removal.
However the real surprise (to me) was how great the TripleFi 10s sounded with these. I thought the bass might be a bit stronger due to the deeper insertion/better seal, but the improvement was much more than I would have imagined. The bass is stronger, deeper, and significantly more impactful now. I dialed back the EQ on my S9 a bit (it was at +3 at 80hz due to the low bass roll off on the TF10, now it's at +2) because of it. So that really surprised and pleased me. Even more surprising is that it also "enhanced" the highs notably as well. I have a pretty sharp drop in my hearing between 12-14kHz and had the EQ set at +1 to compensate a little. With the Sony Hybrid tips I found the highs too strong and a bit piercing, and reverted the EQ back to 0 at 13kHz.
I don't want to oversell the SQ "enhancements" I noticed with the Sony Hybrids - they were subtle, but noticeable. However I definitely think the sum is greater than the parts in regards to overall sound improvement of the TF10 with these tips.
I did switch the tips back and forth between the UE grays and the Sony Hybrids and do a bit of A/B listening to ensure that I was in fact hearing what I thought I was hearing, and it seemed to hold up. I'd like to give them a few more days to see if maybe my perception changes a bit after some listening before forming a final opinion.
I have no idea why these sound so much better than the gray silicons (maybe it's the seal), but I can't help but recommend them. I wasn't really expecting much, if any change in SQ with them so I don't think it's just the power of suggestion. Whatever it is, they really seemed to have moved the TF10 from a 'phone that I was "happy enough" with considering the price, to one that I am extremely satisfied with.
I'll have to look back through the thread to see if others had a similar impression of these tips, and I'm really curious to see what the rest of you think if you do end up picking up a pair.