Thanks for the impression. I'm looking for another IEM flavor and was curious about trying a dynamic. Are balanced armatures the way to go for speed? The FX500 looks interesting for its quality bass and extension. I stumbled upon the C710 as it seems to shine in treble. So basically, I'm looking for an IEM that adds another dimension to the strong mids performance of the E500/SE530. I value clarity, detail, neutrality, speed, and don't want to sacrifice too much soundstage, isolation, and comfort. The E500 is great for jazz and vocals, and is a respectable all-rounder. Just looking for a balanced IEM that excels in the fast, large soundstage, treble-rich demands of trance and the bass extension and tightness of hip hop, without compromising too much on mids. The C710 seemed to strike a balance, but I'll look into the CK10 and NX55.