I had a T30 that ran 24/7 for about 10 years but started having machine checks, but I was too lazy to see if it was fixable, so I just bought the T40 to replace it. The T30 was a solid machine and I never had a problem with it. I can start to hear some fan bearing failure now in the T40, which means they're not using ball bearing fans and that really pisses me off.