Posted it on HN a while back as well, but interestingly it is one of my least successful HN posts.
Nitpick: A user who is not happy; users are people, not things.
Additional nits from a native US English speaker, hope they're helpful:
* "$5.00 / Per Month" - the "/" is read as "per," so it reads as "five dollars per per month." Should drop either the slash or the "per."
* "...Billed annually. Or..." - these are dependent clauses, should be "...Billed annually, or..."
Posted it on HN a while back as well, but interestingly it is one of my least successful HN posts.