Mine came in yesterday as well.I noticed They're very tip sensitive. When you get a nice seal, the soundstage expands and bass improves a lot and everything sounds so much better. The treble isn't offensive at all to my ears paired with ZX500. They're semi-open back so sound isolation isn't the best. For the money, I love them and prefer these to the Penon Orb. Silver Cable also gave it more 3D sound. However, ISN H40 is still king of the Ring in this price range.

@DJ Core I have the 507 too. It does help with taming treble for sure! I tried out so many diff tips and it was hard for me.

I'm using them right now to watch a movie...kept turning my head to the right or left... I'm hearing subtle sounds outside my personal space which I attribute to the detailed piezo Driver. I'm at 10hrs of Burn in as well. Zero driver flex as well due to the semi-open back nature.

What a lazy review - 1/10. These run rings around the ER4, and the fact that you couldn’t even get them to fit really speaks volumes.
Please read the comprehensive and detailed reviews below and try and learn something.