I am very active on the 335 forum and I have not heard of a single JBD issue since they came out. I ran one of the JB3's on my car for a while, then went to a flash eventually as it was difficult to take the JB3 in and out for dealer service, but the JBD is much easier to remove for dealer trips. When I had the JB3, the service and communications from Burger Tuning was great, very quick responses to email and they seem to have a lot of happy customers.
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2022 X3M Brooklyn Grey
2008 E93 335i FBO
2012 Mercedes C63 Black Series Alanite Grey
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