I was using the 501 II on my Scoutmaster and loved it. I have sinced move up the Shelter food chain to the 90x but you can't go wrong with the 501.
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I didn't think it worked particularly well with a std. JMW9 arm, there was audible mis-tracking, more so then any other cartridge that I have used. It is a low compliance cartridge and the JMW9 is a low mass arm, not the best combo.
That said more then a few people have used this combination successfully. Perhaps the Shelter's have some variation in there compliance.