Buyers must prioritize safety and precision. Ensure the machine carries CE certification for the European market or FDA/UL certification for the US, especially for laser products (Class 1 or Class 4). Key technical benchmarks include repositioning accuracy (±0.01mm to 0.05mm), cooling system type (water chiller vs. air cooling), and control system compatibility (e.g., DSP, Mach3, or GRBL). For fiber lasers, check the source brand (e.g., Raycus, IPG, or JPT) as it directly impacts the machine's lifespan and beam quality.