Don't let the unkempt look deceive you, their pizza is pretty amazing. The fact that the price is pretty cheap is just an added bonus. Compared to other places in the area, its a steal for good food. When you don't feel like paying 10 bucks for a meal that would otherwise cost half that, Slices is great.
I couldn't decide between three or four stars because of how dirty the eating area looks. However, I give them the benefit of the doubt for having really good pizza and pretty friendly staff - at least anytime I've ever been there. Its small and homely inside but for me it adds to the atmosphere.
Oh and its conveniently located next to a Palm Reader and the Hippie Gypsy...