I like this signing.
Lets look at this objectively:
The Starters
-Del Piero, despite obviously being the man and capable of 15+ goals at the Serie A level, is not getting any younger and could run into injury...
-Trezeguet, if he's back at all, had a little bit of a step backwards last season and relies heavily on the players around him to be effective. Likely capable of 15+ at Serie A level still.
The Subs
-Zalayeta: Capable of the odd goal coming off the bench, but likely on his way out. Not a guy capable of ~10 Serie A goals, since he only has 12 goals in 85 appearances for Juve.
-Palladino: Looked decent for Livorno in Serie A, but was in Lucarelli's shadow and only had 2 goals in 21 appearances. Relatively unproven at the Serie A level. Not a pure finisher, and hasn't shown he's capable of ~15 Serie A goals yet.
-Miccoli: If he plays for Juve, was decent for Benfica but clearly not first choice, and had his best season with Fiorentina with 12 goals in 35 appearances. Could he step up and score ~15 if one of the big two go down? Possibly.
Iaquinta: Has not scored 15 in one season, but has come off 14 and 13 goal seasons with Udinese, and has proven versatility with Udinese and the Italian NT. Juventus is a step up from Udinese, and should get more opportunities for goals. Proven starter at Serie A level.
Is he expensive? A little... but he's a proven commodity and could likely be back with the Azzurri.