The first version i received was assembled incorrectly: the plastic body had 2 exposed tabs and did not fit together. The bobbin winder was misaligned and did not work. The needle was too far off adjustment to align it with the bobbin hole, even when taking the cover off and adjusting.
The second version was functional but required adjustments and the tensioner seems to stray frequently. The lift arm mechanism in the thread path is not a smooth piece of metal which causes snags with fine threads.