I prefer a vise with a base.
I can grab the vise and easily set up on the front porch or on the picnic table out back. I can pass it accrosss a table at a show.
I do agree that you need a non-slip pad underneath. I also use shelf liner that I pick up at the dollar store in one of a dozen colors.
Ed
" Fishermen, hunters, wood choppers, and others,
spending their lives in the fields and woods,
in a peculiar sense a part of Nature themselves,
are often in a more favorable mood for observing her,
in the intervals of their pursuits,
than philosophers or poets even,
who approach her with expectation."
Henry David Thoreau