Fitbit: Is it worth it or not?

For a while now, I've been seriously considering getting a Fitbit and wondering if it would be worth it. While I have funds to buy things I want, I definitely am very frugal and am very careful with my purchases. I go through the, "Do I want it or do I need it. Is it necessary? Is it helpful." I'll weigh the pros and cons and research it to the death.

Here's the Fitbit pros.
1. I hear a lot of people say that they're motivating - they make you want to get your steps in.
2. It will tell me approximately how many miles I would walk or jog while doing DDR. (The DDR counter tells me it's about 10 miles. Considering they also tell me I burn just over 2000 calories, I think counter has to be flawed.)
3. It has a sleep tracker.

Here's the Fitbit cons and what goes through my mind when I think if it'd be worth it:
1. I'm already motivated to move. I love DDR. I love to hate Jillian Michaels. I love the treadmill. If I don't work out, I feel gross. When I do, I feel great. I like feeling great over gross, so I'm motivated to move. Plus DDR is fun. Jillian has changed my body in so many amazing ways. It's not hard to get up and go.
2. The sleep tracker and the steps/miles counter would definitely be interesting information. Is it NECESSARY? Hmm.
3. I have to be a Lose It Premium member to have it link with Lose It.
4. The price. Right now it is in sale at Target, if I get the Flex, at least. (I've been going between the Flex, the Charge and the Charge HR) It's $80, which makes it 20% off, but even $80 is significant. $80 is a lot of groceries, or a lot of fun stuff at Michael's, and things like that.

I'm not sure I can justify a $80 purchase for something that is INTERESTING but not exactly NECESSARY and that really sucks. I do want one, I really do. But I have to be smart with my purchases. When I start getting careless, I start slipping. Hm. 

I don't know if anyone reads this, but if you do, leave me a comment.

Do you have a Fitbit? Like it? Hate it?
ARE YOU FRUGAL LIKE ME? WISHY WASHY AND INDECISIVE? PLEASE TELL ME I'M NOT ALONE!