Edit: The New V3 Coils Have Saved the Crown II
After receiving the new, version 3 Crown II coils, my opinion of the tank has been redeemed. The first two versions of the coil that had the black O-ring never lasted me an entire 24 hours. The new ones with yellow O-rings, however, outlast the Crown I coils by a day or two. I'm not sure what they did aside from changing the color of the rubber seal, but whatever it was, it worked. These coils put out flavor that's as good or better than the original Crown's, which when put together with the improved aesthetics of the tank make it #1 in my current four-tank rotation.