Did the installation in my 67 GTO (w/factory air) myself and found it to be a long process but took my time and only cussed a few times. The only additional expense was having it charged at a local shop. That was in the summer of 2016. the unit is still going strong with no issues, no leakage of any kind. Do have to say that there was a lot of duct hoses to run under the dash and things got a little tight in that regard. I would say A++ on support as I got halfway into the install and realized I had been sent a condenser mount kit for a 64.......they overnighted the correct one no charge (of course). I would also say that the directions were very nicely done as well. If you are not aware, you can go to their site and view an/or print the instructions. FYI: The folks at Dakota Instruments make a climate control kit that I'm going to by, I think. Costs $400 but it is made for the Gen IV unit specifically and is endorsed by Vintage Air as well.
Chemnick
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Just an old goat cruisin' in an old Goat........LIFE IS GOOD!!