Ruby on Rails

Does anyone develope with this platform? Its been around a couple of years, and seems to be growing in popularity. I first heard of it about a year or so ago from a friend who started to develope with it but never looked into it beyond that. I am a PHP developer and was thinking of broadening my pallette by looking into Ruby. So I am soliciting feedback on working with the language (if you could even call it that, more of a framework) and how rapid development really can be. I have seen the video's on their main site which are pretty interesting though wish they had a bit more on the fundamentals.