So I got my Ultimate Ears 500 yesterday.
They only cost $45, come with the silicone AND a pair of Comply foam tips (though I have a box of comply foam tips I got for the Monster Turbines that did not work well for them.)
The stock tips to gives me that terrible airplane pressure feel, so those tips are absolutely unusable for me.
I put the Comply foam tips on (both the ones that came with it and the ones I already had), and I was surprised that it didn't destroy the SQ like they did with the Turbines (the sound on the Turbines became pure mud and bass when using the foam tips, with absolutely no treble or other details). Dunno what the UE 500 did, but the treble still remained beautifully sparkly, the bass was just a hint deeper, and details were still basically the same.
Love the fact that they have flat cables too.
If I could compare their tonal balance to any full sized headphones, I'd say a cross between the DT880 and DT990 without the full sized soundstage or treble edginess. The bass was emphasized (more than the DT880, but not DT990 strong), the mids were akin to the DT880, and the treble was slightly less than both, meaning their is no jarring edge to them, though they are still sparkly.
For $45, these are just fantastic. They also sound fantastic with the Sony Hybrid tips I also have....
Dunno why the bass is so ridiculous looking on the graphs, but that isn't true to what you'll hear. Also, the treble was airier and sparklier than the Turbines, unlike what the graphs show. The mids are identical to the DT880 on the graph, which is how I remember it.
Unlike every IEM I have owned, the UE500 needs absolutely no equalizing for me. They sound just spot on in stock form (foam tips or Sony hybrids, stock tips sound too damn treble oriented, though I believe it's just personal fitting issues). That's saying something about their sound signature.