It was a while ago now, but I used Schwab as my initial broker, also had scottrade for a while. Street Smart Pro was definitely one of the worst platforms I encountered. Definitely below scottrade, which wasn't good as well. Maybe for order execution it's ok, but it looked like something out of 1995.
I used street smart edge as well for a while. It's certainly much more advanced than street smart pro. I don't feel it's nearly as good as a platform like thinkorswim, but it's at least a good step above street smart pro.