I liked the Unify chestpiece option and most items I had in beta it worked fairly well, but there were a few items that just... well, I wasn't sure what to make of them after the unify to chest went into effect. Some lost their textures and became a bright pink, etc.
That being said, I would really love to see this feature, or an improved version of this feature reimplemented. I'm playing a Jedi Knight right now and I'm seeing a LOT of the same armor just re-skinned into another color, often to find the one I get not being the preferable style, while the nicer designs are green or blue and not customizable. It takes a lot of mixing and matching to get something that looks cool and there isn't enough custom armor in the game to allow a whole lot of variation for that yet(as of level 41 JK Sent). Although I will admit it's not quite as bad as the Trooper's armor selections lol. I've encountered several "Trooper Bobs" that look like they're scavenging their way through the galaxy... Without paint.
I'd much rather prefer to have manual customization (I.E. a simple dye system) opposed to premade color themes. That's like the companion customization, imo, which I don't use because often I don't feel there is much of a need for it. Although I do kind of miss Corso's tattoo that made him look like a Kiffar...