VTEC was pretty much the first mass-produced variable valve timing system. '89 for Japan in the Civic/CRX SiR, and '91 for the US in the NSX. The XSi, RSi, and SiR-II followed in Japan, the GS-R, Si, Ex, and VX (VTEC-E) followed in the US. Add all the other DOHC VTEC, SOHC VTEC, VTEC-E, and iVTEC models around, and Honda has the most widespread variable valve timing system.

Add to that the fact that is works better then a lot of other companies versions, and you have a winner.