So I got the S118 and I subscribed to BB@home. the quality is questionable. The HD's are about at best 720's or even lower in my opinion.
Before I got BBMP on my 722 and 612's, I had a firmware version that allowed me to look at the data rate and it hovered around 8Mbps on my Cox connection. I think the PQ is fabulous! Even the SD is good. What download rate to you have?