Just wondering, and apologies if you have mentioned this elsewhere, but what type of music do you play? I see several Gibson pickups listed here, and BTW, being uninformed, I was wondering what a Gibson MHS pickups is. Of the Gibson pickups, which would you say is the "warmest"? You have quite an impressive collection of guitars. I just wish I had not sold my Gold Top LP (either late 60's or early 70's), honestly I can't recall as I sold it probably almost 50 years ago. I bought it off of the classified ads from a woman who was selling her away at college son's guitar. I bet he was pissed! I really wish I could get a LP, rather than build one at this time, but I am scared of the quality issues many here have mentioned, and I haven't seen a good deal on a used one. The one for sale on the site here in Montana looks really nice but I am not near there, and I think it is priced a bit too high.
Well, a little bit of a lot of things. Mostly what I'd call blues and classic rock. Started playing in '85, still enjoy some metal, but not my main thing, either. Floyd, Zeppelin, AC/DC, Sabbath, stuff like that. I have some other guitars that I use for heavier things, though.
The MHS pickups (Memphis Historic Spec) were made while the Gibson Memphis factory was in operation. I don't believe they were ever available aftermarket, but I may be mistaken. There were two series, the first (what I have) is based on "early PAFs" (according to Gibson) and use A2 in the bridge and A3 in the neck. Mine measure 7.8k and 7.3k, plain enamel 42 awg. The second series is based on later patent number pickups, short A5s, and 42 awg poly. Mine came in my ES-345 and are definitely staying. They are some of the best PAFs I've ever heard.
I'd say the MHS are the warmest Gibson pickups I have (leaving out 498s, which are a different beast altogether). They are warm, smooth, woody, and have a great bite without ever getting close to harsh. Incredible definition and string separation, too. Not sure how to describe this, but they sound "old" in a way that nothing else I have tried does.
Comparatively, the Custombuckers are really nice, too. They have a little less mid and a tighter, rounder bass. They are bright, maybe the brightest of the Gibson pickups, but are still very smooth and not at all harsh. They are punchy, kind of like a big Fender or Hiwatt vs a Marshall, but have this wonderful "clack" (for lack of a better word) to them. They are very clear sounding under gain.
My second favorite of the Gibsons are the Burstbuckers. Mine are from 2003 and I've heard rumors that they may have changed some since then, not sure how they compare to current versions. These are warm, smooth, and powerful. They're A2, but not like any other A2 I've heard. Not overly mid-focused, but definitely strong mids that still sound open. Bass isn't mushy at all, or at least not like a lot of A2s can be. If I was going to play heavier stuff, this would be the set I'd use. They sound amazing under '80s style gain.
I understand your concerns about quality issues, I've seen a lot of chatter about that. But, what I can tell you is that I haven't experienced any. When I bought my R0 (new) last year, I play about 20 of them. They were all great guitars, all had "that" sound, and all felt incredible. It really came down to the top I liked best, which was not a bad thing, but I did not expect them to be that consistent at all. While I haven't played a ton of production Gibsons, the ones I have were all good guitars without the quality issues others have talked about. While I'm not doubting that some exist, I haven't seen them, maybe I'm lucky, IDK. The last new Gibson I bought (before the R0) was a 2019 SG Jr. It needed a little time to settle in, like they all do, but once it did, it's become one of my favorites. I haven't found any problems with it, even the stock pickup sounds good. But, you're right to be weary... best advice is to play before buying if at all possible and shop around. Some amazing discounts are definitely available on new and the used market seems to be correcting itself after the pandemic (finally).
And yeah, I bet that mother's son was NOT happy... Ouch!!