To be honest, your post was just OK, but it lead me to your button generator (http://www.performable.com/buttons/), which is hands down the best online button generator I've come across.
[insert lame cancel button pun here.]
I love the critical feedback!
Would love some on how we can make the button generator better.
Having the "Yes, send me product updates (big improvements coming) & marketing tips!" checkbox enabled by default gives off a bad smell. It is the little brother of e-commerce sites that sneak stuff into your cart when you aren't looking.
Let subscriptions be an active decision instead of an accident.
I'd love to see some data showing what the most popular calls at action you're seeing are...