I think the biggest benefit to the SJ is that they can be had for cheap. I bought mine for NEW on eBay for $300 + 60-80 shipping. Though this was a while ago, the main reason it didn't sell higher was that it was a 220v version and no one seemed to want to deal with a transformer. It was also rebranded Rio labeled, nevertheless it has held up like the tank that Mazzers are.
If you're thinking to spend upwards of $800 on a new grinder, why not make the jump to
http://www.chriscoffee.com/products/hom ... /maxhybrid I believe it's quite a decent upgrade from the SJ, but depending on if you can get it locally and such the gap might be a bit bigger, but I think it's worth it.