A little goes a long way and really makes a huge difference. I have dark circles no matter what and this beats out any other concealer or product I've tried in the past. The under eye brightening affect really makes a difference that I didn't realize I needed.
In order to make it last longer and not smear I've learned to apply a primer, then erase paste, and then set with a light powder. Its a little time consuming, but the results are completely worth the added steps to my routine.