The Lunar was equally attractive...my eventual reasoning was that the PI just looked different from everything out there. There are already off center dials, at least more than an inverted movement with an off center dial. The big date and moon phase also was nice, but I decided that I liked the idea of seeing the balance wheel and the engraved balance cocks on the dial side. Just that bit more interesting than one with a traditional setup.
Been a few years now and I've no regrets. The new versions now also give a big date display for those that want it there.