Did you actually have look at the stats of the robe!? The Circle of Sheshhsehshs thing "only" has a wis +5, while with the Ossus Keeper Robe you get in the museum treasure is: cha +2, int +4, wis +4!
That's impressive stats to get from only one item. Of course int +4 might not be that usefull to everyone but you still get your cha and wis boost.
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Ossus Robe is too ugly =( It should look like...a Jedi Master robe just a little browner. They should also have that LS lightsaber crystal...I can't remember the name, it does +1-12 to dark side and its restricted to the LS only.
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Just beacues you think it's ugly doesnt make it less powerful. And that's just a matter of taste anyways. I actually like the red Ossus robe and prefer that style over jedi master which is to clumsy in my taste....