played the 1st 2 on 360, got the last one on ps3
#2 pissed me off cause I couldn't unlock Lunamaria :/
the screen feels a bit more cluttered now (?)
and I don't understand the upgrades/development in this one :/
just minor stuff.
Think you just had to complete a certain mission as Shinn to unlock Luna.
Development is pretty much the same as 2, but plans are for the suit as a whole rather than seperate parts. Then each plan has slots which can be used to upgrade the stats a little.
Optional parts are handled a little differently:
Each main suit (Gundams, etc) have one ??? that will become a unit-specific part once you get the respective character's friendship to level 4, and 3 empty slots.
Each generic suit (Zaku, etc) will just have 4 empty slots.