Cautiously optimistic about the trade.
The good:
Multi-level scorer
great 3 point shooter
age fits Dame's window
high character guy
No more minutes for Rodney 5.6 PER Hood
Powell 17.65 PER, Gary 12.72, 13.77. PER is NOT the ultimate, but from a PER POV, it's a slam dunk.
Powell's defense is supposed to be pretty good. It's GOT TO BE better than Hood/Gary. Along with more NAS minutes, defense should improve.
The Bad:
undersized (though our chances improve in the 6'4" and under league

)
Is a UFA and will be asking for $16 to $20 mil PER.
Helps the team in a place we didn't need help, which begs the question "are we going to get any help where we need help?" - e.g. defense, bigs.
Not a PG. IMHO, this will kill Ant's career (because he'll be stuck as a PG).
I'm sure others have more thoughts, but this is my immediate first take.