I Googled and found a couple of sites that sell this. It is definitely not one of the most talked-about setups; I had never heard of it before.
If you are thinking of buying a longarm setup, it's a good idea to do tons of research and try out different machines at quilt shows before investing in one. This can save you a lot of problems. I would also suggest joining the homequiltingsystems group at yahoo.groups.com and asking about the Empress there. It is a very large and active group of longarmers and midarmers, so you are likely to find someone there who knows more about the Empress.