Just thought I'd report back.
I think I'm past the honeymoon period, and I LOVE the Custom. It took some tweaking, and I really started loving like full-on once I removed the tone pot and added a 1 Meg pot, but I don't think that's the Custom's fault such as the acoustic quality of the guitar being kinda fat and thuddy.
But what I really like about the Custom is the high-end is open and detailed. It's not quite as airy as say, a '59, but I can totally hear the "PAF on steroids" vibe in the pickup. The low-end is bigger than a PAF-type, and the nature of the high-end is distinctly Ceramic, but what I love the most about the Custom is there is no hint of stuffiness, cloudiness, or honkiness in the mids, thus leaving a very open nature to the pickup. The "good" kind of mids for me, the high mids, are still present and aggressive, but they're not like a JB where it's where that pickup punches the hardest. The Custom is more balanced throughout. Not to downtalk on the JB, though, but I think the Custom is a completely different kind of pickup which I've come to really bond with.
I'm glad I gave the Custom a try.