The 'Free' plugin version is a joke: full of adds.
But I actually bought a one year plan, cause I wanted a quick solution to a mobile version of my site.
Looking back it was totally insane and absurd to pay $9 per month or $7.2 for the annual plan. I pay €1.15 for my excellent EU web-hosting, so why would I pay another $7.2 to host a mobile version at dudas?!
And yes it's full of bugs and in the end it drove me nuts so I had to cancel.
Something else; when you sign up to the yearly plan you can only accept automatic rebilling. And if you like me cancel before, let say after 3 months, your site is returned right away to a free very limited version with ads, so you lose your 9 months payment.