Logo evolved into modern-day Scratch, which is included with the pi (raspbian).
http://el.media.mit.edu/logo-foundation/what_is_logo/history...
http://el.media.mit.edu/logo-foundation/what_is_logo/history...
But Scratch is one step up the ladder to me. It is a commitment to an eco-system and a super nice but blank canvas.
I find Logo to be simpler and more limited. This is a "good thing"(tm) when getting kids hooked. The first hit should always be free :-)
I have gotten some of my non-technical friends to buy mbots. They like the idea but the learning curve was to steep for them.
Their hardest struggle was dragging the blocks around with the touchpad. It would have been less frustrating to have a keyboard-based interface I think. (Now that I type this, I realize maybe I should have tried a two button mouse for them.)