Any negative point on not using a necklace with sidemount ?
I started to use long hoses on both tanks as well.
It depends if you are using sidemount configuration versus sidemounting. (In sidemount configuration you are diving with tanks on your side,in sidemounting you are entering restricted, tight situations and require this advanced form of diving). If you are sidemounting, having a necklace placement of a regulator is okay,but having a regulator long hose around your neck can be problematic when entering restrictions. I like two long hoses if I am diving with a back mounter, in which case I have the two second stages attached to the corresponding chest area, which makes finding and deployment easy, and eliminates the hose around my neck.