I have not tried these but there are numerous reviews on the internet. Most favorable but some calling them a gimmick, but some people will always call foul on anything and maybe more so if they haven't even tried them. Not unlike the Kampfar.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli