I love the Luxura pen. It is crucial to be able to do 1/2 units if you are a Type I. I read somewhere to make sure the insulin actually squirts - not just dribbles out the top to be properly primed. Also, make sure you count to 10 slowly before you remove the needle from your skin. The only thing that would be better is it if it had the memory - just in case you thought you gave yourself a shot, but got distracted and did not give it. I have found myself priming the pen, my attention went elsewhere, and I put the pen away. :-(