In my oppinion it is worth the weight.
i also had lightweight rigs before..i was so happy..walked in the hall smiling, set up my rig smiling.
after that i walked out again to help the guitar player with his heavy all tube marshall, not smiling, put it on stage, not smiling.
after that i helped the drummer with his heavy drums, not smiling, put them on stage, not smiling.
no i take my sunn or svt smiling, put it on stage..smiling;)