In the 155 sidemount dives that I have done, I may have used the inflator hose to dump gas no more than three times. I really don't go vertical much at all and when I do it isn't to ascend. When I go vertical it usually means I am diving rapidly or suddenly or looking at something where that position is required. I sometimes ascend upwards through an obstruction but never at a depth where the relatively short ascent can't be managed by my lung capacity. The inflator hose is quite inconvenient for me. Different styles of diving I suppose.