It works, well sometimes. There are decent Signal groups out there that is managed by expert traders. But of course, When you trade you must not always trust other's opinion at all times. Because how can you become independent if you rely on their signals? Make the signal something you do after making a speculation on the market just to double check your decision.
For me, i don't prefer using signals even from the start because we can still make our trading successful with our own efforts. Trading with paid signals may be less risky but it won't make you a good trader in the making if you completely depend on it. Study on your own and with experiences you will gain, it will make you a better trader eventually.