I just noticed that as part of the same deal, VPN unlimited offers a 3 year subscription for $US 19. That might be a better way to go than $39 or $34 lifetime because it would be an inexpensive way to find out if it's any good. The single device at a time, is not a limitation I would be overly concerned about, as I don't use multiple devices on the internet at the same time. Marilyn does use a Mac in the house at the same time as I use a Linux box, but I don't see her doing anything for which a VPN would be of great benefit.