I've been hearing a lot about To The Moon in a very positive light

Very good. You will most likely cry. I did.

I've bought two copies of it and still haven't played it.

The story is amazing.

Keep in mind, if you decide to try it out, it's really more story than game. An interactive story, if you will.

It is completely worth a playthrough but be warned to have a chunk of time to devote to it. Majority of people that I've talked to about the game had to finish it in one sitting.