Aftermarket Air conditioning units?

I've worked with both.

Vintage is a nicer unit by far, and all servo controlled, however you have to get creative with the crappy grommets for the firewall connections and no grommets for the heater hoses. The servo controlled heater control valve has an almost 100% failure rate. Classic has a cable controlled box which has flimsy cable connections at best. Neither system has the ability to mix fresh air.