It works extremely well, after doing some experiments to find the optimal current setting. The low purchase price means a very good value for money.
Some ideas:
1. The enclosed nickel strip appeared to be nickel coated steel. It would be good if this were specified in the online specifications.
2. According to specifications, the device consumes between 2 and 15A mains current. At the higher side, this is not true: my 16A current tripper (B-characteristic) had to be replaced by a C-characteristic one in order to withstand the much higher than 15A current spikes. This should be more clear in the online specification; for people without the option of upgrading their current tripper, this welder cannot be used!