I don't like products that give no detail. I understand that extensive detail will not always be provided else products can be copied but they are extremely vague. With that out of the way, does this thing replace the main unit or get added?
The install blog says "Replace the glove compartment and the radio and enjoy the Carplay by pressing the MENU button for 2 seconds" which suggests this thing sits
between your existing unit and the rest of the vehicle, electrically speaking. Then, when seeing the Menu button pressed for 2 seconds it would provide video to your screen instead of your main unit. The blog shows an LCD In and and LCD Out connector. Looking at the colors their labels are somewhat misleading and should be labeled "LCD" and "Main Unit" instead. In any case, that sorts out the display.
I'm not sure I trust this company or it's product. The product shown on the linked page is not the product shown in the Golf 7 install blog post. I admit this could just be a mistake on their site, but for a $500+ product I want the site to be right. The lack of detail is another issue. Also the design seems overly complicated and there's NO way I'm giving up the other MIB I functions just to add Carplay/AA.
I'm not sure what's going on with power. I suspect some type of "Y Harness" is being used for power/ground. There are so many wires on their power plug that I have to think Nuje is correct that they are also tapped into the speaker outputs. But that would mean this unit must also an amp (and it could be, but again, no details provided). And like Nuje stated, not going to work with Fender... which should be highlighted on the product page.
If I were designing this... I would use a "Y harness" to get power/ground, then I would connect between the main unit and screen (which they do) and also between the main unit and aux in. To use my
product you would set your audio source to Aux and then something similar (like Menu for 2 seconds) for my box take over video. That would mean everything in your car still works as normal. Your Aux input is now for Carplay/AA (only when you have selected Carplay/AA video, otherwise I just pass it through so you can still use your aux port and you get Carplay/AA video when selected. I wouldn't "touch" anything else and I wouldn't need your VIN.
HEY, none of you steal my idea