Really effective

I'm a yo-yo-dieter. I signed up with NC in 2009, and lost a good deal of weight, and kept it off until last year, when for various reasons, I took my eye off the ball and reverted to pretty bad eating habits. Since the start of June, I've been very rigorous with NC and once again, the weight has been steadily dropping. I really like this site for several reasons - first of all, if you are UK-based, it is really fast to use the food diary - you simply write in the first few letters of a brand or type of food and you get relevant choices very fast. You can easily copy and paste entries, and it logs fat as well as exercise and calories. The system is really simple - if you have a green tick for the week, you should see either weight loss or measurement loss. Also, there are some encouraging trackers and report systems so you can monitor calories, exercise and weight loss effectively. The forums are incredibly supportive and encouraging. The only additional thing I would like would be a carb and/or sugars counter included.
You do have to pay to participate, but there are frequent deals and ways of spreading your payments, it is cheaper and easier than other sites/systems and the app/web interface is good.