It's fast, efficient (and free) at converting old Obj C into modern swift! I love that it doesn't give me any errors or warnings as long my syntax is correct - which makes this tool great since sometimes you can get caught off guard by things like autocomplete not working correctly if there are multiple methods with same names but slight differences between them such us "initWithString" vs ".withstring". The only thing i dislike about Swifitly was how hard some of its features were/are still difficult compared other apps out here today; however after using xCode 10 beta 1 recently released last week now everything has become easy peasy again ;) If your looking forward trying something new then definitely go ahead because all these tools tend too be outdated once they release their newest version so make sure u grab one while y.