I'm pretty confident Metallica & Dream Theater have sold more MESA Mark series amps than Carlos Santana.
On an interesting turn of events, how's the 5150s rather being better known for the "Modern Metal" sound than Eddie's sig. tone? Found it amusing. Most people I know associate EVH with the Plexi rather than any iteration of the 5150.
To be fair though, the Mark I was a very different beast than the IIC+ and all it's iterations afterwards. And Santana really epitomizes the Mark I sound