People at JetBrains are looking for MPS users to interview. They are also offering a reward of your choice: either a 1-year subscription for the JetBrains All Products Pack or a $50 Amazon eGift Card.
I think it is a great opportunity to discuss how we are using MPS and provide feedback.
If you are interested you should fill this 5-minute pre-interview survey: https://surveys.jetbrains.com/s3/MPS-User-Personas