I have a pair of B&G Neo3 PDRW tweeters with the back cup removed. I'm pretty sure I bought these from Danny at GR Research. I've had a DIY dipole speaker for a few years, gone back and forth between the PDR and non-PDR tweeters. I recently bought a pair of Maggie MMGs to try something different, and was going to start parting out the drivers in the DIY speakers soon to get back some of the money.
They've been in a narrow-baffle dipole, crossed LR4 at around 1800-2200, so never pushed too hard, and driven by an Emotiva amp. No pets, non-smoking household. I can take pictures and post them here if you want. I was going to start researching prices and putting the drivers up for sale. I don't know what they're going for these days. Make me an offer