I know, I know, this is a super broad question. Many companies and individual engineers actually use phases of Model-base Definition right now without implementing an enterprise-wide program that enforces such. Any time you've created "Limited Dimension Drawing" or state on a drawing note to reference the model for definition of your product, you are using an interim step of MBD. So, I guess the real question isn't "Are you using MBD", but "How are you using MBD"? Either way, let me know! Are you using DimXpert? Do you skip drawings (just send the model) for initial quotes from any of your vendors? Do you use an Overall Profile callout? Is there an enterprise-wide effort to embrace MBD?