Here give you some suggestion when you purchase laser machine.
1. Laser tube brand, choose better laser tube, for smaller power, Giant in China is better, for bigger power like over 100w, Recile and Deos is not bad;
2. laser power supply. better ask the aftersales service.
3. Machine control system. Usually offline controller with USB interface is more convenient for you. In this way, you can operate machine on the LCD screen of machine.
4. Better see the sample photo or video of your work from supplier.
In the process of laser machine using, suggest you buy industry chiller to cool down temprature of laser tube for last its life time, remember put purified water or distilled water to chiller; Take good care of lens and mirror, often clean them with absolute alcohol.
Any question, can ask me.