Visited Arriviste today for the first time. Really cool spot! I was somewhat boring and just ordered an iced coffee - but their options are endless. Lots of speciality drinks to try, so I'll definitely return. The location in Shadyside makes it really convenient for foot traffic and there is street parking all around it - making it relatively easy to find a spot if needed.
The only disappointment was that I wanted to sit down & enjoy my coffee there, but there wasn't any seating left. It's a smaller place, but if you can find seating, it seems like a great place to meet a friend or to get some work done. Employees were very friendly.