So I wasted about 1 hour of my sacred sunday to try all the tips included in the bundle and I arrived to this conclusion: it's all about the sealing. If the tip has a good one you have one sound sig, if it doesn't, well you have a crappy SS or at least a very very very different one.
That being said, since there are so many different tips, different sizes and different materials, it's not easy to tell which are better among those that give you a good sealing. But I didn't give up in front of the inglorious and harsh task and so I'm now able to tell you who's the very bestest \o/
I could have done an exaustive review, a comparative spreadsheet, an html with links and details. But frackit, didn't I say I already wasted 1 hr of my sacred sunday? I think I did so here's what you get
And if your eyes are not bleeding already, take these more detailed ones
Just to clarify, the difference between the first and the 3 I placed 2nd are very thin. I could have placed them all first because probably with some kind of music the result could have changed but with those I treid I came to this conclusion: the red veloury ones are the best. One major "winning aspect" was how they helped giving a bit of warmth and depth to the sound sig of the IEMs because they are clearly mid-oriented or at least lacking in the basses (mid basses, sub-basses? You tell me) and if the sealing is not perfect the SQ goes down the drain very quickly. That's also why I put as "first of the third place" the memory foam ones.
Another thing to say is about the size since most of them come in 2 or 3 sizes, so just to clarify even further, the 1st and 2nd placed ones are all large, while those in 3rd place are the mediums. No small could give me a good sealing so they're all off the chart, together with the large memory foam ones because they just couldn't fit and the black 2-staged-conic ones (sorry dunno how they're called, you'll have to figure this one out) since they weren't sealing properly like the small ones.
Ok, I'm pretty sure I just wrote the worst review ever seen on head fi so I'll leave you with that and go waste my sacred sunday in some other way