The bond via Blutooth between tablet and keyboard took place without any problems. The battery life of the keyboard is good.
The bag / envelope makes an impression of quality and is well made. Direct contact between tablet and keyboard (risk of scratches) can be prevented if necessary by a cloth or thin fleece you put in between when you close eg. Anyone who has a Displaschutzfolie on the tablet, can do without it, because the frame of the keyboard essentially rests on the frame of the tablet.
I have the NINETEC Keyboard Case Bag far in use and therefore no long-term experience, but stand today I would buy it immediately. For this price, the set is unbeatable.