“I have had a Kern 150 watt (tested @ 180) 52×100 and have been running it daily for almost 2 years. With that said the Kern machine is a rock solid machine with no down time yet. Still using the original optics. Doing routine cleaning and alignment is the key to keeping any laser running its best. I can not say enough about Kerns tech support it is the best. I have 6 lasers now and all the other manufactures could learn something from Kern on how to keep a customer happy. Kern is a family owned and operated business and treat their customers like family.”