I'm curious to know how well it performs. I spent the better part of this weekend rewriting 4k lines of Swift in Objective-C because I couldn't deal with the 60-90 second compile times.
Disclosure: I write Android apps, so I'm only occasionally peeking at how the iOS dev scene is developing. I've already been thinking of trying to write Android apps in Scala, but maybe this Swift to Java compiler is also worth looking at