Actually, there are several levels that I have come across, on a 1 to 5 scale.

0-No lucidness, just an average dream
1-No lucidness, except directly at the end when you wake up, does no good
2-Somewhat lucid, no change in dream
3-Lucid, Make small changes in dream, such as walking around
4-Lucid, Can fly, walk through walls, etc....
5-Lucid, Can do 3 and 4, and can get objects in the dream

It feels really cool in the dream, but when you wake up, it feels somewhat fuzzy, like it happened but didnt happen, or at least it is for me, then I start doubting that it was really lucid.