If you are asking if a rear strut bar is worth it, then yes.
If you are asking if that particular one is worth it then my respone would be that all a strut bar is, is a peice of metal that ties the left and right strut together. So, yes.
i have the front and the one in the hatch and the one on the lower rear and trust me it is well worth it...handles great....while everyone else is slowing in the turns you can punch it..its a great feeling..lol