This is disturbing! I've been looking for a "one gadget to rule them all" solution with power management due to my SON hub, and am coming back around to either Digifit on my iPhone, or a Sigma ROX 9.1. Digifit iBiker has nice on-line features, though I don't want to deal with a pile of batteries. I have some lower-level Sigmas and they've been very reliable. I have already given up on a Ciclo HAC and a Polar CS something. Polar make some great HRMs, but I'm not sure they did it right when they tried to expand to a cyclocomputer.
OTOH, Sigma make a great cyclocomputer, and I don't know how their HRM functions stack up to Polar.
But if ANT has a handful of batteries to manage, then it drops off of my list, and with it all Garmins and the whole iBiker suite.