I have a few Satriani albums. Not of this Earth is my favorite and is very different from most everything else he did after it. Has a very different vibe. Surfing with the Alien is great, as is The Extremist. After that I am just not familiar with much he did.
One cool note about The Extremist. The CD came out around the same time as Lanny Cordola's "Of Riffs & Symphonies". Both albums had very similar covers (smokey, tan color) and some
of the same studio musicians (Greg & Matt Bissonette).
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ULTIMATUM - TOO METAL FOR WIKIPEDIA!