Thanks for the great feedback! To your points:

1. Depending on your dataset the training could take from 45 mins to a few hours. We do need add an ETA on the build in the UI.

2. The input schema is inferred towards the end of the model building process, not right at the start. This is because the final schema depends on the decisions made regarding input features, model architecture etc during the building process. You should see the sample curl update soon, with actual input fields.

3. Great point about upfront rejecting builds for types of models we don't yet support. We'll be sure to add this soon!

We're in London at the moment, but we'd love to connect with you and/or meet in person next time we're in SF - drop us a note on LinkedIn or something :)