I use one when I am not on my home network almost exclusively. It connects to my home network so that I can manage my home automation "locally" as well as access my cameras when needed. I have Tasker set to turn it on/off when I leave/enter my home network. I have noticed Zero battery issues. Not sure if that is related to commercial VPN servers or not though. I suspect it really depends on your signal strength wherever you are. But then, it would be the same without a VPN as well.