Review (4/5): Not really an "upgrade", but still a good razor
I have owned two Norelco Quadra-Action razors, and I was very pleased those. When I accidentally dropped my last one I decided to go ahead and step up to SpeedXL line, thinking I would notice significant improvements. The razor still does a great job for an electric, but I have to say the changes Norelco has made over the Quadra line are not noticeable to me: It takes the same amount of time for me to shave, the same few places are hard to get smooth, and the battery life is about the same.
So, if you are considering this and a Quadra-Action, I would suggest you save yourself some money and go with the latter, seemingly-identical razor.