Airtac VFC AK adapter

Hey guys, I'm going do the sin of "Hey I just bought this is this any good" posting, just a heads up. I saw one pop up on the used market for cheap and I bought it on a whim. I know what I'm getting into for the most part, and I know airtac is a lot more reputable than other companies so I'm not trying to justify my purchase

I'm just hoping I can find someone who has put a lot of rounds through it who can give me some advice or warnings about this piece of kit.

I'm also now in the market for an HPA rig. I'm on a budget and I don't wanna dip into my savings and the used market around me is pretty dry. I'm really considering getting the aliexpress regulator/line. I've heard people either say it's going to explode and kill me and everyone around me, or they've bought tons of them and they work fine with a little bit of lubrication to the O rings. Are airtac adapters picky with these cheaper knockoff regulators?