>>6494140Char's Zaku has a quirk where it's knee joints have a sort of soft-ratchet to them that has put some people off. The green MP Zaku does not have that issue. Also, some folks have reported the hip joints on their Char Zaku have gotten loose over time (again, green Zaku seems to have resolved this).
While my Char's Zaku's hips are fine, and I'd still recommend the release if you're interested (if only because it has my favorite effect part, the machine gun muzzle flash), but it may be a good idea to get the other RDs you're interested in first and wait for a sale to grab Char's Zaku (it has gone on sale several times).