When I first saw the Leebo crew card I didn't see the point, but having flown a few lists with Outriders and Falcons with EU, Leebo is beginning to look quite attractive (for a droid, I'm no robosexual)
He's half the cost of EU
I rarely need to boost more than 2 or 3 times per game so one self-induced ion effect per game is no biggie - especially if I can choose when I do it.
Ion weapons aren't that common so no major worries about triggering the ion effect when you don't want to
He leaves the upgrade slot free, opening up potential combinations with experimental interface
I've only got 1 EU card