Replacing old wood deck boards with new composite deck boards on an existing frame. To make sure I don't have to do this for the last time in this house I bought the stainless steel version for the corrosion protection and the longer version to make sure I could fit snugly in the existing joists. There is a learning curve, just like with any new tool/fastener. I've had a few panties, strips and snaps before, but most were in the learning phase or when I wasn't paying attention. Overall good impressions from the 500 I've installed so far.