Personally I use it as a second PSU for my Lenovo IdeaPad U330P. Compared to the original Lenovo-330P PSU here this provides less amperage (3,25A to 4.5A original). In theory it would be possible that the device consumes more power under full load (4.5A * 20V = 90 watts) than is available from the charger (3,25A * 20V = 65W) and the notebook then despite charging cable connected slow would unload. The difference in the current values into practice, however, only means that the unit is charging more slowly than with the original power supply.
The price is unbeatable with 18 (original power supply 50), but the quality suffers not less. From me there is therefore the full 5/5 stars.