Based on my experience with M50v1s, M80v2s, and onwall M22v2.9 (no mag grills or silver caps, but with all other upgrades), I have to say that the tweeter improvements have been marked. If you've got the itch, I'd say give it a shot. The M22's highs were incredible and the imaging was great.

I am the Doctor, and THIS... is my SPOON!