I totally agree with buxom! The results aren't major but it doesn't hurt the way some lip plumpers do--causing me to be a bit scared of them! Lip Fusion also didn't hurt and worked a bit better. Both have sets so you can get a bit more for your buck.
If you are feeling brave the Too Faced Lip Injection works--hurt me, I had to take it off but I've read others use it just fine.