I own a pair of these things and love them... but they do come with some bad things too.
*They are super comfortable. Even if I didn't get any sort of "weight loss" with them, they are great if you are on your feet all day.
*They really do work your legs. Now, I'm not saying that they give the exact same workout as going to the gym, but you do feel a nice little tingly sensation, especially for the first month that you own them.
*They give you an extra 2-3 inches in height, a great thing if you're short like me!
*I work in a junior high school, and I have more than once been told by my "fashion savvy" girls that they look like old people shoes. Now I guess the reason the girls say this is because the sole is so thick and they would resemble special orthopedic shoes.
*They give you charlie horses in the first few days of getting them! I went through one or two bouts of that because I worked my calf so differently than I was used to.
*If you aren't careful, you can very easily lose your balance, especially when getting up from sitting (and yes, my kids enjoyed watching this too!
Would I buy them again? In a heartbeat.
I am a firm believer that your shouldn't buy this product to "lose weight" because I really don't think you will with these. They are, however, the most comfortable pair of sneakers I have ever owned. I may check out the dress shoes that they have eventually too if they ever come down in price!
Hope this helps!