The interface is very easy to navigate and I feel like my Amazon SEO project manager understands my brand needs. It can't be used outside the U.S., so we rely on their US only services as well. Not an issue! Keep building with it and adding features that will get more competitive in search results without cutting off other markets (Canada). Try it first at no cost. If it doesn't fit your objectives, go the local SEO route or keep going if it does work out. Working to understand and measure results of Amazon keywords across several sites vs. competitor performance on key terms. The best part about merchant words was that it gave me access into my competitors keywords which were not easily accessible with other marketplaces like amazon or ebay etc.. I can now go ahead an start working as per their suggestions so i would recommend this tool because they are very good at there work! It takes time but if used properly then its worth every penny spent by them. They have given many tips & tricks related to seo/smrting through these programs.