Anybody here ever use this stuff? Does it work? Is it a viable alternative??

I have an old car with an r12 system that still operates but it needs a charge. I was just wondering if this is a good (short term) alternative. I plan to upgrade to a newer rotary style compressor and 134a in the future but for now, if this stuff works, I would consider it.

Link: http://www.es-refrigerants.com/products/w/id/3/default.asp

(Not promoting the product -just looking for information)

Any one using it??

Product called OZ-12 works good.

Change the drier, add the correct charge of Ester oil, toss the old schrader valves, screw on the R134a adapters, evacuate, charge to 80% of the R12's old charge weight.
Fill out the conversion decal.
Enjoy the ice cold AC.