I needed an adaptor in a hurry for a short notice long haul, and ended up with the Kensington. It does look very much like the Juice, so I suspect they share the same heritage. However - it does exactly as it says on the box and has worked very well with both a G4 iBook & and Toshiba Portege on empower seats and 110/240V.

The iBook is primarily my wife's laptop for homeworking, though it travels on family holidays as a DVD player and on the fly video/photo editing suite.

The Portege is my corporate laptop, and despite being a Mac fan with an iMac in my home office, I have to admit it's an excellent light, stripped down laptop to travel light with.