lorax - 12:23 pm on Sep 12, 2008 (gmt 0)

>> where does it fall short in terms of SEO?

Bloated code and organization of the code are issues I have with X-Cart.

You'll also notice that if you have statistics turned on, the site will get slower over time. Do yourself a favor and separate the statistics into a database of their own - this way the site will remain relatively fast and not slow down over time.