I'd like a UB1 someday, too. I have played a couple, and they are TINY. Shorter and narrower than a normal soprano, although I don't have the actual dimensions. I was at a ukulele gathering in Chicago a couple of years ago, and one of the women there let me play hers. I let her play my Gibson Uke 3 (top of the line Gibson soprano "normal" ukulele). The UB1 was very noticeably smaller-necked. I've never played a UB2, but I understand they are closer to a concert scale, if not actually that size.