KDAD
Contributor
True, but you can dive a single AL80 with the right rig with no problem. Initially I suggestes a SM rig because the OP was looking for a rig he could use for double tanks AND single tank diving. IMHO, a good SM rig is more versatile than any bp/W configuration. Most people that dive bp/w have more than one wing... lot's of SM divers use the sme rig and home and on vacation.
I brought the topic back around to sidemount because the op is looking to get talked out of bpw. The other alternative that is of consideration then is sidemount. Benno, the benefits that you mention give sidemount strong weight. Like many have mentioned to them it is just another tool while for some it is their only rig.