I used to think that the speedy was the least practical bag ever. But, I couldn't ignore the following that it had. So, I bought a pretty old, beat up speedy on ebay. That way, I hadn't invested quite as much in my experiment.
Within a day, I understood why everyone liked it---it just works. I now have that old speedy (25), a newer 30 and a brand new, never used, 25!!