Many years ago Google stopped using the keywords meta tags in web ranking. This meta tag was so often abused by hackers and sites owners who don't follow decent guild-lines. Other search engines might use it so it wont hurt to implement it in your page. You will not get penalized for using it. However, if you are worried about competition, I suggest removing all keyword meta data because it will allows competitors to see what keywords you are trying to target. At comnitro, our SEO specialists don't even bother using this tag at all.