Very good material, except for one ...

Quality sander, like most Bosch products. It's slightly more expensive, but you pay for and the hardware is built to last. It pumice good, not too much vibration.
Only small problem (already noted by many users) is missing a few tenths of a millimeter to the plastic from the electrical outlet, which tends to lower disconnect traction. It is neither serious nor dangerous: an extension cord, a flexible node and the case is settled.