This is great, look forward to reading the second part.

At first, the price seems expensive, but when I think about it, it's really not. You are offering a lot of functionality when it comes to scheduling tweets and that's a feature people will find super useful (unfortunately a lot of those people may be spammers, but at the end of the day as far as your concerned, your business is your business and theirs is theirs).

I'm not a huge advocate of freemium and I would not suggest lowering the price, however you may want to extend the free trial period a little longer.