I have tried lots and lots of different PUs (2x Throbak, 3x Skatterbrane, 3x Seymour Duncan, 2x Zhangbucker, Wizz, Leslie's PAF, 2x Shed, vintage Dimarzio, Kloppmann, Rolph, and I'm probably forgetting some). I agree though that the Dry-Z's have something unique. "Dry" is a very apt description, but on top of that there's a certain aliveness to the tone that I like. I don't particularly care for them clean (I prefer something rounder and fatter clean and the dry Zs to my ear sound too dry and they have some fizz on top that's hard to dial out), but with a bit of overdrive they're great for a honky tonk type of tone. I think they'd be especially good for warm / sweet sounding guitars. I have a LP with a fat neck that makes most pickups sound almost cloyingly sweet, and I think the Dry-Zs would be a good match with that to counterbalance it and give it some balls again. I haven't tried it yet but it's on my to-do list. I do like them enough that after buying my first set from Wulf, I soon wanted a second set as a backup in case something goes wrong with mine. I got those from Wulf too, so I plucked him Dry.
That said, desire for variety aside, I like others even better. Leslie's PAF has for me the best bridge I've ever heard. I've never played real PAFs, but his get closest to what I think they are, a certain quacky brightness that's alive and never shrill. I like several others too, and the most important thing is finding the right pickup for the guitar. Don't take this as pissing on Phantom's sale. I do think they're unique, and worth having if you have multiple Les Pauls. They wouldn't be right for me if I had only one LP because I don't care for the cleans, but who here has only one LP?
PS: I do think that framing them as mere "restoration" parts is selling them short though. My two sets live happily in a Navigator and the Bison LP that I bought from Wulfman.