Anyone heard of this? My brother asked me if I've heard of it or knew anyone that's runnig one?

Lots of folks running them now. For more "propaganda" and info check out Hemi Truck Club and look for MrHemi, BrianR, and others in the supercharger/turbo section.
Be aware that some/most of the 2003 F/I folks are having trouble with tuning. The main difference is that the 2003 fuel systems run at 49psi while the 2004+ models have 58psi. Some have switched to the 2004+ pump and regulator which solves many issues.
Good luck, there ARE choices out there!

Thanks, I will pass this on to my bro.