I had a few of these. Don't really know, but for me they seem like nothing special at all and the players didn't perform much better or anything.
I play in text mode so I can't tell you if and when they get activated in the animations.

For the versatile attacker I posted a more detailed experience in this thread here:
https://forum.topeleven.com/top-elev...l-time-20.html

The only SA from sponsor which is really worth it in my opinion is the set piece taker. You get freekick, corner and penalty SA all in one and you could combine it with a shadow striker second SA for example, which makes a really good player.