I avoided ALL CO2 products because of a bad experience in the early evolution of these systems. I figured you can't go wrong with an old style hand pump. This CO2 inflator appears to be idiot proof. Believe me I would know. I would recommend this product in a heartbeat.
Very satisfied with size that easily fits in small saddle and easy to fill tire. Others I have had were cumbersome. Good price and shipping...bought another for our mountain bike.