I had a set and got rid of them quite soon. Far too heavy to cart around and in the water and unless you are planning to do some serious diving are unneeded anyway. 232 bar 12's have done for anything up to 60m + for me without coming close to getting empty.
By the way, I am no lightweight for carrying them around, while I am not fat I am over 6 feet and fairly heavy rather than a 5ft flyweight