I was a bit skeptical of "break-in" until I got to experience the harshness first-hand with my new A/V-1RS speakers that I built. I was watching Batman Begins (4K UHD disc) a couple weekends ago, and the scene where his parents are shot about blew my eardrums. After that, I ran them through an MP3 burn-in ("frybaby...") that I found on here, and after 48 hours or so, they sounded significantly better (harshness reduced, more depth, more natural).
That said, I would definitely recommend the upgrade at the very least. I still use Klipsch in my game room (what was my former "media room"), so now I have a direct A/B comparison of what I thought was great sound to what I KNOW is great sound, and I'm still optimizing. Once you hear the difference in Danny's speaker designs compared to off-the-shelf name brands, there's no going back.