I don't think you can respond to posts with the free version.
You can set it up to give you a notification when you get a PM or someone responds to a subscribed thread. I'm not sure if that's available in the free version.
I'd say paying the $1.99 is worth it. I just put a disclaimer in case people complained to me about waiting their $2 back. I don't think we'll have any problems though.
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