My boyfriend took me to Zio's while I was visiting Springfield. It was in a great location and a great building, but we had to wait, even though it was just the two of us on a Sunday night. The staff was friendly though and went around offering pizza samples to those who were waiting which I thought was a nice touch. And the pizza was really good.
The menu was typical; similar to a Macaroni Grill or Johnny Carino's. They had daily dinner specials during the week - I had cheese ravioli and a side salad for $7, which is cheaper than some places. The dessert menu looked awesome, but I was too full from my dinner to try any. Overall, I was impressed.