i saw some video reviews, sounds like the app has some issues disconnecting sometimes, the sonar unit itself looks very nice and works well but the phone app you have to link it to needs work. its a new technology i would give it another year to mature.. all they need to do is improve the app and i would consider buying it myself.
Not worried about phone battery as I have a couple pocket battery for recharging plus a “halo” battery that gives several recharges and fits in shirt pocket.
Thanks for advice as did not hear about app problems. Holding off for now.