I never heard about them.
When going to and from Lima airport, I use the combis at Lima airport. They leave every 5 minutes at the busstop at the airport. They charge 1 sol and get you where you want.
When heading back for the airport, I take the combi at Avenida Sucre at Magdalena Del Mar or Avenida La Marina and they they take me to the airport in 20 minutes. Those shutlles are the most convenient way to get to and from the airport.