My daily commute is about 10 miles each way. Been doing it on my Giant Escape for a while now.
I've got a chance to pick up a Giant Defy really cheap. I think it's a 2015 Defy 3, in good mechanical condition. It's a large frame, so should be the right size (I will definitely test ride it).
The Defy will take a rack and has ample room for water bottles, handlebar bag, etc., so it would be a good commuter.

I'm concerned with switching from an upright hybrid to a drop bar bike. I haven't ridden a drop bar road bike since high school (33 years ago!), other than a Cannondale that I tried and hated.
The Defy seems to have a non-aggressive profile and, from what I've read, I can put a 2" riser on the bars without changing cables.

Any advice or thoughts on switching to a drop bar bike for commuting, specifically the Defy?

I suppose the worst case scenario is that I buy it, don't like it, and then re-sell it.