These SEO URL modules are completely redundant. They are not necessary. They do not help with better SEO. They do not improve your page ranking potential. They are risky to install and use, and (according to Google) may actually HARM your website's chances of good SE results.
Anyone who tells you that they DO improve page ranking does not understand how search engines deal with dynamic URL's these days.
You see, there is no such thing as a "SEO URL"... it is a term made up by charlatans in the so-called "SEO Industry".
Search Engines regard the url purely as the GATEWAY to your site's content and information flow (its logical structure, relevance and content depth). The actual URL is not used AT ALL in the actual ranking of a website.
So, if you tamper with the URL, you actually RISK "damaging" this gateway, and you could actually end up hiding or masking important links and content that the search engines DO use in their page ranking calculations.
It's up to you whether you want to continue to be hoodwinked by all this SEO URL nonsense, or whether you'd like to research the topic yourselff. Look on Google's blogspot for what they say about static URL re-writing.
Our organisation has built over 100 zencart sites over the last 7 years and we have NEVER used these "seo" modules. And many of our clients are enjoying page one results on many key phrases on all the main search engines.
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