As someone who started out learning cued speech, it's a great tool to learn lipreading and how speech works. But as a permanent solution, it has it's drawbacks. The fact you're using one hand more than the other to make the movements, can be a problem.
I used it for 3 years, before I learned sign language. So I do recommend using it to teach lipreading and speech. But once the child or person has mastered speech and lipreading, I'd move on to sign langauge.