I had a Hydros pro for a while and found it rather lacking, using a single plus pony it was not capable of stopping me from tipping over to the side without perfect counter weight and always felt like just a big air bubble that would move around the bladder at any opportunity. Being on my side it was very unhappy with this configuration and just never felt that it was in stable trim. Probably just fine with a single tank but if you dive asymmetrical I would say beware of this model. I don’t find this issue at all with my Atomic BC2 which I love.