The Canadian government does not endorse Hydrocarbon refrigerants such as Enviro-safe nor do they prohibit their use.
I also read some stuff out of Australia that recommends the expansion valve be placed in the engine compartment on new cars. Nowhere have I read of any dire consequences actually occurring from using this stuff. I am still looking. If there was anything more than a very minor risk I am sure there would be evidence of it on the internet including case histories. The stuff has been around now for several years and is being made by at least two manufacturers here in the U.S. I intend to give it a try when I return from a trip in about 3 weeks.