I am a huge fan of the Francis. I have owned and used both the Silverload and the Francis many times. I would use the Francis if I could. It is cheaper, works just as well or better, is more durable, and it is lighter making it easier to keep in a mount. If you are running an amplifier bigger than say a Texas Star 350 you will want the Silverload. Although, I have run a driven 4 pill through a Francis for a while in a pinch without failure. Surely wouldn't recommend it though....
Mopar