DELL Quality???????????

Dell 5150 has design flaws! My 5150 died after 26 months, MB was dead. Dell said I was off warranty and no free repair. In searching for a MB found out there was a Class Action against Dell for this computer. Warranty extended 1 yr. Called again and Dell repaired. Failed after 31/2 months. Dell repaired. Failed again after 3 months. Dell said no more, sorry. The computer was never properly repaired but they refuse any liability. Bought a Sony Vaio. No more Dell for me (have bought 7) again.