I want to say it's somewhat good, but sometimes it just doesn't work out too well, and experience may vary between developers. But I totally agree, if some of it's quirks were sorted out... Sidenote: I'm really sorry I can't mention any off the top of my head, it's been a year or more since I last touched it. I did enjoy using dub, but ran into some odd issues from time to time. If it breaks, you can't use it properly basically.