Shadow Moon has the extending hips, actually. Black/RX, Decade, Diend, Agito, G3, Kuuga, the Ryuki guys, and all the variations thereon are the only figures that I remember having that kind of hip. The extending hip is standard, but don't let one or two scary reports shake you - I have about a dozen Figuarts with that hip joint and I've never had a single one break on me. So have lots of other people. I think Tiger is the only Figuart I know of with it as a big, widespread problem - the rest are just random bad QC cases and most toylines will have that issue.
I just want to make sure that I'm not going to drop $100 on these toys (like Shadow Moon) and end up having a figure I will have spent that much on for nothing and have no way of replacing it.