Does the machine stay within specification over time?
When designing the V2 we did a 500 hour run test under 0% load and re-measured the machine after that time. Everything performed within specification. We also manufacture our own worm gears on a Pocket NC V2 and have run the machine several hundred hours and the gears are still made within specification.
We have some users who use the Pocket NC V2 machine extensively in production or small-batch production runs of parts, or extensively prototype parts. Over time these users have not noticed the machine to drift out of specification. When we get back a heavily used machine we have run the calibration sequence and found these machines to be within specification.
In some instances of a very bad crash the machine may fall out of specification depending on the conditions of the crash, but in general even with a crash the machine stays within specification.