Yes I have used it , at the Meguiars Day that I attended as part of ukmkivs.net
I don't really like it. Far too small. Maybe for use as a replacement for spot pads when using a DA but doesn't really have much power behind it and of course it attaches to your battery powered drill.
It's really quite pointless to me.
The Silverline is a rotary polisher so for inexperienced users it is more dangerous and I don't like them at all, they're very heavy, noisy and have a lot of vibration
Try a 3M or a Flex rotary and then jump to a Silverline and you'll see why it's 1/8th the price.