The catches are too fiddly 
The drain is too high making it impossible to fully drain and clean the tub
The filter cuts out whole unit without warning at erratic intervals. 
The system does not restart after a power cut. 
Despite the above observations I am pleased with the tub and have bought a second one, so please regard my observations as valid and worthy of consideration.  Both tubs are for Airbnb guests and perhaps a good recommendation for those considering buying a tub. Certainly I find myself as you unofficial salesman.