Plus Foldersync is way harder on battery, I've experimented a lot.
This is very configuration dependant. With an aggressive schedule checking a large number of files, it certainly can use a lot of battery; but I've had it setup to sync my entire device to my server a couple times a day, while also monitoring/syncing images immediately on creation/change. It doesn't even register on androids battery usage monitor as it uses so little power.
Anyway; just listing an option for people to look at
He followed through with the sentiment too.