Yes, but I have ... reservations. Same as with OCaml, I took on a small project with Scala and enjoyed the language, but only after carving out a subset of it that was palatable. Although it fits the bill, I'd be worried that enforcing conventions would become a large burden.

Unlike Frege where I (might? Frege's the only language of the three that I haven't investigated thoroughly) can point learners to essentially any Haskell tutorial and have them vaguely do 'the right thing', there exists a subset of Scala developers who use the language like Java with type inference. With Frege I could, for example, merely enforce the minimal usage of IO or State, but doing so with Scala is more complicated (maybe force the usage of cats/scalaz and their equivalent monads? It's still very easy to not use them, however). If there were an equivalent to F# on the JVM I'd settle on it in a heartbeat, but the dearth of well supported, pure functional languages makes this a tough choice. All in all, I'll probably go with pure4j, but it would be nice to stop writing Java at some point in my career.