@mdalton
Congratulations on your fine purchase. I did look into MJ Acoustics before buying REL’s. I do like their high quality build and bespoke veneer finishes.
My experience with Tannoy’s super tweeters is nothing but positive. They have added a refined sense of air and spaciousness to my Canterbury’s. Are you likely to hear more decay, space around instruments and top-end shimmer on things like cymbals or strings….I guess, it would come down to your listening position and room acoustics. My listening position is 9.5 feet away, and the super tweeters are positioned roughly at ear level when I’m seated.
With careful positioning of super tweeters, the benefits are obvious especially with acoustic, ambient and jazz recordings.
I did watch Kevin’s YT video, I must admit, FYNE Audio super tweeters adjustability and omnidirectional design is quite impressive. I’d expect it to deliver a similar or better enhancement due to its omnidirectional design. If your speakers sounds bit rolled off or closed-in up top, they might be the right fit. Are they absolutely essential, only you can decide after careful integration with your speakers. I do know, my super tweeters are inseparable from my Canterbury’s.
Let us know if you end up trying it—I’d love to hear what you think!