I've been using MFP for about 40 days now. I have never been able to stick to something so regiment-like, not even my daily multi-vitamin.
MFP users please add me: http://www.myfitnesspal.com/emsguy85
I find it extremely convenient. I have an Android phone, and what many users don't realize is that if you install the app, there is automatically a widget installed. If you hold a blank space in your home screen and choose widgets- you'll find it to drag to a home screen. You'll never forget about logging food intake again. It has a quick barcode scan button too.
I chose MFP over Fitbit, Fooducate, and the other's; because MFP's nutritional information seems to be the most accurate. I can scan the barcode of a product with 99% faith that it's going to be legit.
I'm down 13lbs in 35 days, because of this app being using in combination with Fitbit (I have a Fitbit Flex). I also use iCardio (another Android app) with a $50 Polar H7 Bluetooth HRM that accurately tracks my caloric output during workouts.