I am always a little suspicious of products that claim to help you lose weight. In truth - I have lost a lot of weight in most people's terms without resorting to any products. I have done it all within 16 months - which is really not a long time when you think about it. I doubt that any product would have given me results too much faster. In my opinion - you cannot beat really good nutrition and leading an active life.
You can monitor your nutrition by using a tracking website like fitday.com. It enables you to monitor not just your calories - but also things like protein, calcium, fibre, fats and a whole host of nutrients.
Many of us take some form of supplement - but it tends to be things like multivitamins, omega-3 fish oils and things like that.
By doing things the natural healthy way you learn new habits which is the best way of keeping the good things happening. Most of us do not want to be taking products for the rest of our lives. You are also not at risk of products disappearing off the market or the formula changing.
At the end of the day - we all make the final decision about what we ingest. I hope that whatever you choose works well for you.