I added my first ever SA this season, put Free Kick ability on my 18 year old Nordeus Gen ST.

I intend on keeping him for a good few seasons though.

I don't see the point in adding them to players you intend on selling though, as they don't add any value.

However, people are more likely to engage in bidding wars for young players with SA's, so it's win/win WHEN it comes to selling him.

Still, it's a tough trade, when you could add an extra star to a player instead of an SA.