I use this day in and day out (and will need to buy more in the next few weeks!) I absolutely love it, I don't wear a lot of makeup, and never wear heavy makeup, so this does it quite nicely for me though it did take some getting used to, to be able to put it on right and not end up with thick patches where I hadn't tapped the excess off the brush well enough.
I set my MAC face and body with this powder every day, and it has not failed me yet! I also wear it on it's own frequently and it sits nicely without anything underneath.
I decided to try this mineral powder after my revlon colorstay aqua had run out and also since it was on special with the bonus of receiving the brush for free :) Although it does not offer a huge amount of coverage (which is fine with me as I don't really need a lot) it does not feel like you really have anything on and since having oily skin it really does help.
Tips: Give it a good blend on your skin and if you do want a bit of extra coverage use a bb cream first and then apply this as a powder on top.