Why would you not want this, a properly undervolted system loses no perf and gains lifespan and draws less power. Amortized over the now increased lifespan of the processor you could end up with hundreds of dollars of savings, especially in a laptop where a dead CPU or battery often results in a full system replacement. Undervolting is why my 4 year old HP laptop still gets 6 hours of battery life even with heavy mobile use every day.