Well you can get him for free and yeh he is a very good signing for free but i wouldent play him all the time as he is old and injury prone but yeh get him
he is good but based on the amount of midfielders u have at the start, i would advise against signing appiah as the midfielders in your team are much better. you can strengthen by signing some forwards though.
Appiah is much better than he appears. I signed him for free in the first season at Olempique Marseille. He scored 10 goals, 7 or 8 from outside the box. Great midfilder and very underated.