I bought one last year and the first thing I noticed after unpacking it was that the zerk fitting had snapped off. I recovered the ball and it felt like it was made of brittle plastic. I thought, "Great, serves me right. Cheap Chinese Costco ****." It was simple enough to replace the broken zerk with a quality one I had in my parts cabinet. I loaded it with some lithium grease and haven't had a problem with it since. The only other quality issue with mine was a big gouge in the paint just under the sticker. It was irritating, but not a deal breaker. I didn't want to pack it up, lift it back into my Z and return it to Costco, so I just painted it with some car touch-up paint, and it looks okay. Other than the cosmetic issue and the broken zerk, the thing is built like a tank. I bought a polyurethane pad for it off Amazon so it won't do any damage to the underside of my car; the rubber pad it comes with is just weak.
I was actually a bit surprised at how low profile it is. I can't get my other jack under the Z without rolling it up a small ramp first, but the Arcan fits, no problem. I'd rate it 3.5 out of 5, with points deducted for quality control, weight and skimpy pad. I'm going to drain it and replace the jack oil this summer before my next big project. Given how heavy the jack is, I'm not really looking forward to that.
Overall, it was a good deal. It's not the best jack I've ever used, but for the price, it's hard to beat. I wish I could afford a $500 USA jack, but that's just not happening. I have two USA jacks that are 20+ years old that both need to be rebuilt. I'm going to try to get around to that sometime this year.