John, I guess I'm one of the few individuals that enjoyed the instant access of the Music Finder Directory, which was eliminated with the SX series. Though I have hundreds of registration banks available as well, the MFD was my go-to directory of songs that allowed my instant access to the next song while still performing another song - it was a great tool for onstage performers that, for me, eliminated dead time between songs. Ironically, most folks on the forums rarely used the MFD, claiming it was versatile enough for them, therefore, they went to registrations.
My MFD contains about 700 entries, which took me nearly three years to complete. I totally agree with you about taking your time to grow and add to the registrations, therefore, creating a perfect registration for a particular song. IMO, there is no instant gratification in building a perfect registration - it takes a lot of time and effort, but in the end, the product is usually what you were hoping for.
All the best,
Gary