I went to CCR for the same reason ,bought a Vision & with lead it was about the same weight as twin 12's & a bp ,The difference came when I fitted it into a KT frame ( not the lightest on the market

) it made the bare unit weigh 1 kg more but I no longer needed any lead (minus 10 KG ).So now my unit weighs 9KG less than my twin 12's did ,I have also used quick mounts for the cylinders which means I can carry the unit less 2 x 3L and less my 2L argon bottle
HTH
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Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards