I did use a z plastic MRV and a Stingray. I lost the MRV at the Checkered Flag tournament in Indy last June and I gave away my Stingray to a friend who lost his one understable disc he had in a tournament earlier this month. I now use a z plastic Wasp and a star Mako, both of which were given to me. You gotta love Karma :) I also have a Roc and a Shark that are my backups.
I'm fairly new to the "new" disc/frisbee golf sport so anything I comment on should be taken with a grain of salt, so to speak, but I started with a Roc, found the Buzz - loved it but then got my Lat 64 Fuse.. Oh my my - I can hardly contain my praise for this disc. Unless something crazy happens to change my view, the Fuse will be my go-to mid for EVER! It does what I want it to and floats and glides and shows off while doing so. I'm rapidly becoming a Latitude 64 fanatic.