As a pen their super nice, the economics of the whole thing feels great, its quite a heavy pen, as is also designed to double up as a Kubotan, but it's not too heavy and feels just right. It takes standard Parker refills or you can use the Fisher Space ones, which is largely why it writes so well. I've not had reason to test the window punch yet, but it's got a tungsten carbide tip which I have no doubt will do the job. The cap itself which houses the window punch screws firmly onto the main body of the pen, insuring it doesn't get lost. They retail just shy of £20 and if you are looking for a good pen/window punch, I'd recommend one.
) £7.99 