I did one small pedagogical project in PureScript. As a language, I really like it; in fact I'd prefer it to Haskell in many ways. The compiler experience is good, if not great. Compile times are a lot slower than Bucklescript but a lot faster than ghcjs. Performance is definitely worse, but for many apps I think it'd be fine (and you can always FFI out...). There is a webpack loader for it, although I've had some issues trying it. I've found the syntax to be quite confusing though, even coming from a Haskell background. Parser messages are vague and tracking down the bug can be very frustrating. Also not supporting things like trailing commas is lame (but the same in Haskell). Type errors are also often difficult to understand (even compared to Haskell).

I think overall it needs more development, in particular in regards to UX and integrating into a modern development workflow. I'm excited to see its progress :)