Hi ovizunshop, welcome to the forum. My advice to you before adding any features to your website is to consider how useful would it be for your site visitors.
As for your question, Site Meter is a useful analytics tool that tracks your site data and allows you to display a visitors counter on your website. Personally, I prefer using Google Analytics because it is a standard these days and there is really no need to show your visitors count publicly other than for vanity reasons.
What do you mean by reviews? Are you referring to creating product reviews content?