I've flown GO JET a few times ORD-JAX, always in Y. I maybe like Skywest a bit better, but would rate GO JET ahead of Mesa or especially the previous carrier on that route, Air Wisconsin, in terms of service and reliability. There will be a drink service. Our last flight on GO JET was four hours late, but that was very much an ORD weather thing--everyone was late that evening. One odd thing on that flight--the first officer gave the weather report for JAX in French.