I think the alpine is very well built , very solid. I bought the whole kit straight from alpine U.K. so I got the tried and tested set up for a t6 . They communicate well and sorted out a missing reverse camera cable very quickly .. however the unit was £1215 !!! a pig to assemble, and virtually no instructions for fitting it to a t6 (all parts were there though )and after head scratching a plenty I got it installed . The firmware issue (im hoping ) is just that it is VERY VERY fussy about what memory stick is used, as I’ve eliminated pretty much any other possibility..I was going to get Alpine but since you mentioned its got some issues i really have to think about it.
My 9180 was also fine until a few weeks ago when i saw the dust couldnt be cleaned and noticed the dust inside the screen.
Another issue is fan noise .. it’s quite a noisy beast in comparison with the oem unit or the kenwood . I can live with but would prefer silence .
Apple car play works very well with it (usb) but it has some issues with volume levels using Waze or Siri with voice control .. the volume level is ridiculously loud ..even when the music listening volume is low and seems very difficult to find how to control it ... hence why I’m trying a firmware update .. .. I imagine a much better model will soon be released with a higher resolution screen and wireless CarPlay (knowing my luck)
all these companies seem to be charging totally over the top prices. But kenwood really have displayed some seriously bad attitude towards their customers in my opinion .