i eat a healthy cereal and for lunch i usually have sandwhiches, after work i go to the gym (around 3-4 times a week) where i do 2 days of cardio classes and two days of weight training. i have lost some weight but do these protein shakes work by replacing a meal?

Hmmm...a protein shake to lose weight? Protein will help you gain muscle mass...and muscle weighs more than fat...is it weight you wanna lose or inches? With protein shakes, it's possible to lose inches but gain a little weight.

slim fast doesnt i tried

no they give you horrendous stomach/bowel problems

well i have used them, not to loose weight rather to gain muscle, i use Myoplex?? Lite and Myoplex carb sense. They did work for me but I work out 3 hours of cardio and 3 hours of weight training a week.
If you gain muscle your weight might not change much although you are looseing fat.

protien shakes help you to add muscle so it might be the best way to lose weight.

only if you want plenty of wind.....just eat plenty of fruit and veg that have all the goodness you need,all are easy to digest and don`t make you blowted

I have used the meal replacement shakes with great success. I used the shapeworks ones and they taste nice and they work. You also get free nutrition and health advice from the coach. I have lost 36 pounds in five months and I feel great. The whole system they use is personally designed for your particualar needs and it is full of good nutrition and protein. Try www.myhealthabc.com, I used these guys and they have been awesome. I hope this helps.

men... you don't need this crap.
Just eat right and exercise. It's all about INPUT / OUTPUT.
shakes will only made you to spend money on nonsense