roblumba wrote:That thing looks like it will dig into your portafilter.
Actually, it's the other way around. After years of use, there isn't a mark on my portafilters, but lots of dings on the base (I think mostly from the edges of my bottomless).
I currently have the Bumper tamping base and it has a nice rubber surface and on a kitchen counter it can easily be pushed away to regain the counter space, tamping base and tamper nicely tucked away.
I screwed mine onto a block of teakwood and put rubber feet on the block for the same reason.

I don't understand why you say his is the only one nifty for single spouts, the Bumper tamping base would work very well for single, double or naked.
Where did I say that?