I've had 2 VTEC-equipped Honda products:
A Civic Si with 1600 cc (97 cubic inch) 4 cylinder engine producing 160 BHP with an 8000 RPM redline. This was the DOHC version of Honda's VTEC technology with variable valve lift and duration (2 cam profiles) on both the intake and exhaust. Not much bottom end, but when the cams shifted at 5600 RPM, it was a neat ride to 8000 RPM. Never back to the shop for any warranty problems.
My current Acura 3. 2TL-Type S with a 3200 cc (195 cubic inch) V-6 producing 260 BHP with a 6900 RPM redline. This engine has the SOHC VTEC system working on the intakes only. A nice leather-lined 6. 2 second 0-60, 14. 8 second quarter mile, 145-150 MPH top end commuter car. Again, never been back to the shop for any warranty problems.
Rusty