I went with vortech for several reasons, 1st smog eo# in California
for a manual transmission. 2nd reliability - I helped install vortech on my friends 1999 cougar back in 2001 and he's not had one issue with it in 12-13 years.
I have had mine on since 2009 three years after I bought it, I drive it daily and had 65,000 on the car when I installed it...currently I have 140,000 the idler pulley bearings went bad from the coastal weather "California" that we have. Other than that its been perfect for daily driving.