In this review we'll be looking at the latest offering from Supernote, the A5 X. You may have noticed a recent wave of e-ink tablets designed to be used as a notebook or modern day digital sketchbook. This device uses e-ink technology and has a 227-dpi HD screen.Supernote A5 X review. So, you don’t need to baby it or worry about it breaking. The durable aluminum frame provides protection and ensures that it’s hardwearing. So, you can work on it from anywhere as it fits easily in any bag. Super note The Note Air is super thin and portable at just 5.8 mm thick.