The device looks good and the processing is very high. The size and weight of promises quality, but a little too "chunky", but this could be due to the inner life. Final can be loaded up to 4 units equal time.
The instrument alone can not possibly be used - so if needed best to order a few more microUSB charging cable. At the two "power" USB ports, the devices are also charged more quickly and at the other two, it takes much longer.
With all charging cables off the whole, however, very bulky and requires adequate space. Desirable a device would be to hang (eg holes / savings for hanging bolts).