I played with it a long time ago and the IDE (eclipse plugin?) was a bit of a mess, sbt was prone to weird issues and lock ups and the compiler was pretty slow.
The compiler is faster than it was, but not exactly fast. SBT I avoid as much as possible, so can't really speak to that. The eclipse plugin is sadly abandoned, but IntelliJ has pretty good support.
I played with it a long time ago and the IDE (eclipse plugin?) was a bit of a mess, sbt was prone to weird issues and lock ups and the compiler was pretty slow.
Very fun language tho!