I've worked on Walnut street for several years and decided today to give this place another try. Strangely, sadly, the experience was the same: staff who barely look at you, certainly aren't going to deign to give you a smile. Coffee is fine, but I find that Starbucks of Walnut (on Bellefonte) has the most consistently pleasant people working there.
This Coffee Tree has the fewest smiles/barista I've ever encountered, so they might consider looking for people who give a darn, when they interview.