Human Bean has the best coffee in this area, which is mostly Starbucks on every corner (there's one other place hidden behind Southern Hills Hospital, but I'm not sure if they're even open any more). I'm a no-frills coffee drinker, so I've never tried any of the specialty/blended drinks. Judging by the menu they're up to a dollar cheaper than most coffee chains; a lot of other reviewers seem to love them. That being said, the coffee and espresso, while not the best I've ever had, is VERY tasty - I could probably drink it black, though I usually ask for a little bit of cream, just so it cools down quicker. The chocolate covered espresso bean that comes with every drink is a nice touch too.
The baristas are super friendly, helpful, speedy and always remember what you prefer, even if you only show up once every couple weeks (I'll admit that it doesn't hurt that all the baristas that have served me here are pretty girls with cheery personalities). My first time there, about a year ago, they explained their punch card and specials - there's a double punch day (Wednesday), you get a free drink once the card is full and I'm pretty sure they have a happy hour, I think it's from 4-6.
My only complaint is that I don't live very close to this location any more! It was really convenient on days that I didn't have time to make my own coffee at home. I wish they'd open more locations. Lucky for me, my mom still lives in this area, so when I visit her I always make a stop.
Bottom line: Convenient if you're in the area, great staff, fast service and damn good espresso.