I think I mentioned in my earlier post in this thread that my Technes eclipsed the VSD3S and Puro IE500 in my view. The PM4 simply elevates things.
Haven't used my VSD3S, IE500, or UEs-A1 in eons as a result, which is not to say the first two aren't worthy IEMs (FWIW the UEs-A1 is my only Chinese set which was obtained from the vendor whose name shall not be mentioned.... it's a honker
). I just much prefer my Trinitys as richer and more satisfying.
I've been retired for 10 years now and seem to find myself funding a lot of medical personnel.
The Technes are my go tos for doctors office waiting rooms and the PM4s for walk abouts closer to home. Seated at the computer it's my Senn cans and relaxing in the living room it's my biamped subwoofer augmented Magneplanar stereo system. Music soothes the soul!
I have high hopes for the Master as a refinement of the PM4. I suspect you'll find it will have nuances that top your Vsonic although both will have their place.