My instinct is that most well-versed Objective C programmers won't get much out of Swift. But for people like - non-Objective C programmers - it's been great. I've long since been put off by the alien syntax of it. I've been told numerous times that once you get to know it you adjust, and I believe it, but iOS programming is never going to be my full-time job, so I'm not interested in spending that amount of time getting comfortable.
With Swift, however, I was up and running very quickly. Also running in EXC_BAD_ACCESS errors, but hey, early days...