You should always do the visual checks of the binding and do adjustments actually like every season; and/or every time you have an unexpected release.
This just takes some education on where to look on your bindings to find the indicators and a PZ3 screwdriver. You can look this stuff on the internet or search.
What you don't necessarily need to do is pay a shop $25 or so for a shop to do "binding adjustment and function testing". Where assuming you have the knowledge; your money is really going to the "Testing" part. Paying for a shop to do this service, should mean they use a machine or manual tool test that really confirms the values, and you either get a receipt or paper with the "Pass" on the tests, or you are there and see them put it in the machine and you see it on the screen come up with all Pass.
If they aren't really doing a Test, any good shop that values customer service/loyalty with the knowledge usually just help you turn the screws a bit just for free, tips, or as good will (but with no guarentees or liability indemnity of the work)