Meanwhile, the usually very blunt Kara Swisher (who has experienced all the leading AR/VR hardware including Apple's) just posted a rave on her Pivot podcast.
Her review is almost entirely orthogonal to Karl's. She focuses on the efficacy of the experience. Apparently Apple is able to sidestep a lot of the issues that Karl is mentioning. For instance all the vergence issues seem to be non-existent in her usage. Likely because Apple isn't focusing on interacting with any real world objects.
https://podcasts.voxmedia.com/show/pivot