Nutdog - thanks for the info. I usually call MF and see what kind of discount I can get. I will have to try the email next time. Maybe on a Rumble 115 cabinet to go with my 500 combo.
I visited Sweetwater about a month ago. The facility is amazing! I was a little surprised however, that they only had about a dozen basses on display. I wanted to try a Schecter bass and they didn't have any to try. The Guitar Center 4 miles away from Sweetwater actually had more basses on display.
I have had my 500 combo for a week now and I keep thinking about adding the 15" cabinet to it even though I don't need the extra power. Is it worth adding just for sound qualities alone?