I've used the full and compact GrandTec keyboards and like them, but not everyone will. You generally need a flat surface like a desk, though a briefcase in your lap could work. The keyboard lays flat on the surface, so easier on the wrists for me, reasonably fast but a little more likely to cause errors in typing, wonderfully resistant to coffee, and stows easily in a briefcase. Mine have lasted a few years and I've worn the letters of some of the keys. I don't roll them up that often, though, and they might not last as long that way. The compact version works with the 6000 and 1000 USB ports. If portable to you means "in your pocket" you won't be that happy even with the small version. But if you need a keyboard that's light and takes up minimal space in briefcase, this is a good candidate.