I'll jump in here too and say I've always been a one-headphone guy, so whenever I had two I always felt one was too expensive to be used once or twice a month and sold it on. Then I discovered IEMs. Now I'm a one-headphone, one-IEM guy. Partly because of budget, sure, so I can only afford to keep one TOTL headphone/IEM at a time, but mostly because I'm not really a fan of choice, and much prefer a closed system I can keep going back to for almost-perfect results every time.Will you be selling your other IEMs to keep only this one, or do you think you'll keep them all regardless of how good the Nio is?
With more than one headphone/IEM I'm always thinking: "I wonder what this song will sound like with that...". Drives me nuts.