I also ordered mine from COZero. Very happy with my purchase. I wanted to wait for them to have the English instructions and I'm glad I waited. It was nicely packaged and everything came as described. Shipping was surprisingly very fast. I received the item (after shipping) in 2 days from Sweden to CA, US.
Instructions were easy to follow overall. I did still search for youtube videos to assist me in removing the panels before actually doing it. By reading the instructions, it looks like they went through it themselves step by step to make sure they were easy to understand. It included pictures/sketches to make it easy to see where to wire, what panels to remove, etc... The slight increase in cost compared to those shipped from China is well worth it for just the instructions.
I did have a small issue after installation when the trunk wouldn't close all the way. After contacting the seller and posting on here, both recommended I adjust something on the trunk and it fixed the issue. For about $500, it is well worth the cost to add a power lift gate to your Tesla. Like others have mentioned, it works from the touchscreen, the remote, and the installed button on the trunk handle. I'm happy but my wife is happier since her car has power lift gate and she was disappointed my Tesla didn't have one.
On a side note, communication with COZero was very easy and they responded quickly to my questions.
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