We have been using Nim since 0.18.0 and the bugs we have ran into is minimal compared to the development speed. Some fixes were needed when upgrading Nim versions but all were manageable.
We are very happy for the scope of the standard library - and without it we wouldn't have chosen Nim. We do use Nimble packages, but we keep a local copy of each of the used packages in case the repo owner decides to take down the repo.
