Have just received a pack of Universal Ear tips I ordered from Handheld Audio - these are for the UE500,700, not the UE900, which are different and not as good with the M200.
The large pair of these silicon single flange UE 500/700 tips really are the very best combination of fit, comfort and above all sound that I have found so far. Up till now I had settled on the medium stock tips, but no more - these new ones are utterly perfect. They really do make M200s sing.
Let me just say this about the M200s - these are the best IEMs I have ever heard, and I have heard lots in my time. I think KEF have hit this one out the park.
Wait... you're saying UE 500/700 tips are better than the UE 900 tips for M200?
UE 500/700 tips fit the same nozzle size as Comply T-200, which is much narrower than the UE 900 tips which is the same as Comply T-500
Comply T-400 sized tips can fit onto M200 like the Auvio Tips, but T-200 sized?
M200's nozzle diameter is 6mm