I really like the Music Hall MMF 2.1 that I bought last year, but from time to time I have some tracking issues (there was a thread dealing with that drama a few months ago). Now that I'm doing needle drops, I'm tempted to move up to the Shure V15VxMR. I've read a lot about them here, and have gone back and forth on it. Has anybody used the v15 on the MMF 2.1? Will the difference be noticable?