My first Comment was the following:
Nice looking, comfortable to hold. However, takes a lot of time to stabilize. Holding a heavy bag all this time is impractical, considering that mechanical ones instantly show you the weight reached from one lift. Might be fine for smaller items that you can hold for a while without strain.

The seller contacted me and suggested to replace the item, since it did not appear to work as expected. Today, I received the new one, and indeed the stabilization time is way less than on the previous. Stabilized within seconds.
In Summary: good product and excellent customer service!