At work, one of my production burners, a Philips 2600, has burned on average, 20 discs a day for the past 4 years. So I guess it has burned about 4000-5000 disc and still going. The funny thing is, this particular model is known universally as the WORST burner ever made, yet I never had problems with it. On my workstation I use an HP 9300 and made about 500 discs in 4 months and never had a coaster.