I am using it with iOS, but so far I didn't have any negative experience with it. It already came with the latest software and all settings and things were set from start. It basically was just a thing of plugging it into the USB port, then connecting the iPhone via CarPlay. Once that's done, the CarlinKit will recognize you are using iOS/Carlink and the Ioniq will also recognize the Phone.
From that on the only thing I do now is getting into the car without touching my phone or anything else and it always directly auto connects. The whole thing it pretty fast and usually done by the time I switch into drive mode. I heard the older versions were noticeable slower especially because CarPlay wasn't natively implemented and always had to be converted. But version 5 of Carlinkit has both AA/Carplay native. On the other hand I personally never tested any of the older versions or other brands. For the Ioniq 5 it works absolutely as expected and as simple as can be including all features that are available with a wired connection, from Siri to button controls.
Speed wise, there is a really small delay compared to a wired connection, but its only really something you would notice on a direct comparison, and so mediocre that for normal usage, you will really not care especially considering the benefits of the wireless connections