But is it worth it?

http://www.redhillsupply.com/auto-ac-vacuum-pump-1.htm
Based on info from this site, 1.2CFM is adequate for auto work, but the 2.5 is not enough for residential work.

So what is the advantage?

__________________

Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT