The cool factor at Giant is off the charts. The open-air venue, apart from the front-row view of a CVS pharmacy, is awesome, and I love the layout with its variety of seating options. You can't beat being located a block from the McDowell/Central light rail station.
The Wi-Fi performs very well and the coffee was above average. If I worked a little closer I'd probably list Giant at No. 2 in my Coffee Power Rankings, behind almighty Cartel.
Whether you're trying to get some work done, having a business meeting, or just catching up with a friend, Giant is an option I'd strongly recommend.
One criticism: I do not like the $5 minimum on credit cards. I understand it, but I sure as heck don't like it.