I have limited space available in my service van, and with tools, parts, and cylinders of refrigerant as well as reclaim cylinders there's not a lot of room,, I work on everything at these Subways,, so I carry tanks of CO2 already for beverage systems, and it's what I use to purge and pressure test,,, it's never caused me any issues, and I use a filter drier,,
Haven't used it in anything larger than a 5 ton ac, so can't tell you about effects when used in very large systems,, for what I do, it's been fine..