As panic mentioned, the long term is where they fall short. I installed a few on some customers 5.0 Mustangs back when that was all the craze, and their biggest draw was cheaper cost compared to the better Vortech or Paxton compressors. Plus, as I recall, they have an internal belt drive that makes them quieter, but more prone to slippage compared to the internal geared driven Paxton and Vortech superchargers.
