I usually run four tonearms, but can go to six using pods. I recently did some rearranging because of the re-introduction of the NuVista Vinyl and remounted my MP-500. I not only like its performance, but it makes sense to me to use it for the first play of purchases from discogs, just in case one tears off the stylus. As a result I have given it a permanent place instead of the LP-S. It gives the Decca Reference and the Sussurro a run for their money. They win the race, but it comes close at a fraction of the price.
So unless there are other reasons for preferring a vintage cartridge (and I can understand there might be—see Raul's long thread on vintage MM cartridges), the MP-500 is certainly worth considering.