Playing him next to POTM Pukki has worked a treat, for me he has played 12 scored 12 with a decent amount of assists in a 4-2-2-2 formation.
His finishing (83 )is very good, mixed with his pace (87) and 4 star skill-moves makes it especially hard in this day of FIFA to stop the most effective way I found using him is to do a couple of through balls to break the defence then either finish or lay it off for the 2nd striker to tap in. Although he has 75 stamina he can last easily a full 90 minutes. His work rates are also very useful as he has High/Medium.
There isn't many cons about Callum Wilson, possibly his lack of hight for crosses (5"11) but that can be fixed by using a marksman on him, boosting his Shooting, Dribbling and physical. 3* star weak-foot but so far I haven't seen any tragic misses with his Weak-Foot, yet. Balance is also a let down due to EA's new 'Balanced Passes' but this can be boosted using a sniper or an artist Chemistry Style.