I think the general opinion of freeze-12 is that it is not quite as good as r-12 but it is ok if you are completely changing out the system and not using it as a recharge. I'll be interested to see if the a/c lasts as long as the car or for how long.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory