copper press fitting question

know this is late

know this is late, but i stumbled across this thread looking for something else today.  We have been using these for about seven years on ref systems with great success.  410a too.

http://www.lokringusa.com/refrig.htm

http://www.vulkan.com/en/vulkan_lokring.htm?page=2565%3Fpage%3D2696



daikin was pushing it when they were expanding their VRV line, and i've even seen it spec'ed since then on some no weld jobs.