I own a Sony Vaio laptop. I bought this adapter to replace the heavy Sony power adapter supplied with this computer and to be able to power my laptop from airplane and auto power sources.A power adapter, no matter how versatile, has to be 100% reliable. When your power adapter fails, it's all over for your laptop in about two hours.I have owned this power adapter for ten months. During this time, I have had to replace two power tip adapters. In addition, I have noticed that when my laptop has some heavy processing to do--such as producing a large PDF document--this adapter cannot keep up with my laptop's power demands. Operating voltage drops and the laptop becomes slower and slower.In the future, I will be relying on the heavier, more powerful Sony power adapter.