Jason Snell, on sixcolors.com:
The Boox Nova Air is an impressive piece of hardware that’s let down by its software. Despite Onyx’s attempts to add software to make the experience better, it’s still pretty far short of a good reading experience. The freedom to do anything I could think of on an E Ink screen only revealed to me why other devices with E Ink displays are completely locked down, with specific functionality tuned to specific hardware.
Just ordered my iPad mini 6, but for sometime I was strongly considering this device. Sadly one of its main features — Android app support — doesn’t sound too great. However, for some specific uses the Boox Nova Air seems like a good option.