For powder coating, you won't necessarily see how the prep was carried out. Just like primer under paint, surface prep is critical for good powder coating. Same for surface prep under primer. Correctly would be bead blasted and dipped in detergent several times. Then rinsed a few times. There are also undercoatings or dips that help primer or powder coating adhere better. I generally expect about a 3 out of 10 for Chinese finishes. My Novakon Pulsar was about 8 out of 10 for it's powder coated finish. Still no rust anywhere on it after 4 years and lots and lots of water based coolant.
I would think you should get lots of mileage on the finish of a good laser like these.
Some that have rust issues already may be prior to a change to finish prep, though a company that big should be well aware of proper machinery finishing.