I have ordered it as an extension option for my grade 2. Straight USB sticks and documents are so easy to edit. Having unfortunately lost the first, I've just ordered a second then. This indicates already that I am convinced.
Positives: + No cable break, despite intensive use + Mobile use very large area Do not disturb + short, so the USB Sticks
Negatives: - Optimally usable only with Root - Power consumption increases immensely