First of all, Mr Beam is a DIY kit. You have to assemble it by your own and it is mainly meant for hobbyists, makers and tinkerers. So far, we finished our 3rd prototype which is working very well, but at the moment we can not make any statements about the durability of the laser diode or long term performance.
If you still plan to use Mr Beam commercially, please also consider and maintain the industrial health and safety standards of your country, as well as our information about safety. Please inform yourself about the legal situation in advance. To avoid disappointment and wrong expectations on your side, we would like you to be aware of those facts.