I'm a fan of gonk droids. The removable upper half makes it a worthy figure on it's own and and not an overpriced accessory. A definite buy.
added: Hmm. Totally forgot we already had the bottom half produced. I buy color variations of astromechs, so a modified upper half on this still makes it a plus in my book.
(And I'd love to see the battlebot droid from Solo and the 4-legged power droid from the movie I can't recall at the moment.)