Good to know about those VPulse. I'll look into them... I'm pretty new to headphones to be honest. I've always been an IEM guy for various reasons, portability being the main reason. Lately though, I need something more than my IEMs (CKM500s, the bass is REALLY tight let me tell you) can handle when it comes to imaging and detail, that's why I've been more into headphones lately.
On the M-100 thread someone said that the M-100s handle the ZO pretty well considering how clean and tight the bass is already, it just increases in quantity. With the Paper towel mod and no ZO, the bass is more tamed, bringing the mids and highs more forward without sacrificing detail, making it more even, add the ZO, you got the overwhelming bass. It's on page 666, or 665 I think. I was asking about it, and I too am expecting a ZO by the end of the year, and my M-100's (whenever I get my shipping confirmation, like everyone else is ;_; ). So I'm gonna know how overwhelming it can get myself. I don't even really plan on using the ZO with the M-100s for the most part, unless with this paper towel mod.