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Users have enough login/passwords to remember, and as a general rule, I find plugins that upon install then say you need an account for the plugin to work,as a giant turn off.
Plenty of other plugins in the repository with similar or perhaps fewer options, which are still preferred to signing up for yet another account.
I hate developers that do this, I really do. It's not REALLY free. Sure, there's some limited use, but to really get any value out of it they think you should pay monthly for it. Premium Best value for WHAT? Letting me use it hosted on my own site? One star for being deceitful and wasting my time.
Message after activating I get: Loading, please wait ...
By the support responses it seems like this is yet another abandoned plugin.
I suspect it's a good value, but I wouldn't be running a .org site if I had any serious money. Good luck.