Quoted from TrueJedi:

My issue with Stern is more so with how I'm seeing and hearing them manage quality issues. I've had a few minor issues. What's frustrated me is I had to chase people down within Stern to get a response. Send an email. Wait 1-2 weeks. Send another email. Wait another week or two. Ask my retailer who has a stronger relationship to inquire. What I would find after the fact is that they are looking into the issue or doing another run of the part for impacted customers. No customer should have to follow up on their service inquiry. No customer should be left in the dark. Acknowledging receipt of your inquiry (other than automated), advising it's being looked into, and providing an ETA should be expected. Very simple customer service. Conversely, I've had two small issues with parts on my JJP. They acknowledged receipt of my issue within hours and helped to fully resolve my issues amicably and expediently. No matter who I purchase from I fully expect imperfections. New or used. But if a manufacturer wants me to continue to buy from them they need to treat me as a repeat customer and manage my service issues with priority and value me as their customer.