I've driven it twice. It's top-notch in every way (if you can live with the look of the grill). The interior is a grade above anything they've done before. (We have a loaded X5 now, and the iX is noticeably nicer. And I like it better than Lucid, which is quite nice). I UI is also ahead of anything I've ever seen, altho I wasn't in it long enough to let it get glitchy; the graphic are pretty stunning.
They claim 0--60 in something like 4.4 sec but it seemed faster--our X5 with 8 cyl is rated about the same but the iX seemed quicker.
It's been front and center at the dealership for 5 weeks which seems odd at a time when people wait a year for a Rivian and Tesla, and an Iconiq 5 sells in 1 day for 10k over sticker. My long-time sales guy says people are turned off by the grill, which is exactly why I haven't bought it.