You can recover the film leader if it gets pulled into the cartridge. You need a film leader retriever. I know some people haven't had any luck with them but the Kaiser one I use never needs more than a couple of tries to do the job (usually works first time).
Yes, Kaiser are very good and using one is just a knack (a bit like safe cracking). If it doesn't work first time it will after a few attemps. The problem is if you don't know how to use them and the plastic gets bent.