I bought the HP Pavilion dv4 1520TU laptop after completing my higher studies. That was almost 6 years ago and you won’t believe it but till date it has never given me any major issue. Only once the battery had to be replaced and that too after 5 years of good service.
The Windows has never been corrupted, the screen works fine and the finger touch sensor is still there. It is the longest a laptop remains in good condition I have seen among my friends. I use the lapi everyday for no less than 8 hours as all my work is being done on it. It is certainly better than those Dell laptpos whose battery has to be replaced after 1 year. Certainly the best series in the Pavilion range.