For me, the advantages of the Custom Core over a Standard 150 are:
-guaranteed weight of being under 8.5lbs (which I heard from a dealer that Heritage is no longer guarantying the weight, so make sure you ask for a CC weight) Mine is 8.4lbs. (I personally believe and have heard through my own experiences, that lighter guitars are more resonate and alive.)
-I also believe and have personally experienced that "aged" guitars sound more open, drier, and resonate to me. I think the checking of the nitro allows the body to vibrate more.
-I prefer the "feel" of the aged CC as it feels old and broken in.
-I prefer the look of the CC headstock.
-I trusted the advice and direction on the CC build of Edwin Wilson, formerly of Gibson Custom Shop.
***PLEASE, these are only my opinions, yours may vary. I have owned 4 standard 150s and currently my CC Aged 150. Was it worth the increase in price for the CC over a standard? For me, yes it was, for the reasons listed above. ***