I guess I've just had bad luck with Jelco arms. I had three SA-750s - one "L", two of the standard length; two new and one used. Two of the arms had wiring breaks, one had bearing issues. All three were returned and I never actually got to hear any of them for more than a few hours. I still have a Sumiko MMT on the SP-15. It had both bearing and wiring issues, but it couldn't be returned so it got repaired. It sounded pretty decent on the Technics. I have an aftermarket VTA adjuster with it, too. All arms should come with them I say!