I have had a Dillon D-terminator for at least 15 years, prob more like 20.
Has been reliable the whole time.
I don't like checking the calib of a scale I weigh 5-50 grains on with a 25 gram check weight.
One gram is 15.4 grains, so my check weight is 385 grains.
Your calib check should at least be close to the measurements you expect, if not bracketing the expected measurement.
I run a chem lab, have access to 0.0000g grade scales.
I made 5,10,15 and 20 grain check weights out of paperclips.
Other than that issue, love the Dillon.