The pen works as advertised but the very narrow band that separates the cap from the body is an absolute nightmare. It is far too small to grip, so the body comes off first. I often have to use a pair of pliers to grip it as my fingernail doesn't offer enough purchase. It is a serious flaw in an otherwise good concept. It seems almost unfathomable that they did not see this as a trouble spot. I would not buy it again because of this and I pointed this out in the comments before it reached the shipping state.