I personally like the metru PLATFORM.
by that I mean that I think the sets are alright, but the system is good. for example, I have a metru based toa of air that has full articulation (yes, even shoulders) and still retains the gear function (of which is linked to one arm and has added friction)
basically, Its a good platform to start with, then use a variety of mods and changes to get it just the way you want it