The aim is the same as alli but they work differently. Alli shut down a certain percentage of the lipase used to break down fats, making excess fat run out of your system. These Lipobind, to my knowledge, attach to the fat molecules and surround them with a coating, making them too large to be absorbed by the body.
Alli would yield far better results, if used correctly over a short period of time. Naturally is best, but to kick start things there is no shame in looking for some help in the form of a well tested, legitimate drug. As long as you remember they are not the answer, they are just something to maybe help you along a little bit. Alli are called Alli because they are meant to be an Ally on your weight loss path, not the ultimate solution.