We are using Swiftify to migrate from obj-C to swift and so far it was pretty useful. Won't say 100% works but it does the job. With some small reviews, we were able to use our code again. Pretty useful.
- Helps to prevent redoing the whole code.
- Sometimes it is hard to find the exact command of Obj-C in swift.
- It helped me to learn more :)
- The price is a bit high and not very affordable for small companies.
For me as a picky person I never used the file convertor but for a small portion of code, it is good. With the classes that have more than one initializer, it got confusing and I had to dig to find the exact issue to fix.