I'm still using the Pact BBK I bought in 1995 and it works well for me. I follow a routine to use it (short warm-up period followed by calibration).
1. First thing I do is plug it in then go setup the press (warm up time). This model (pre BBK2) was originally battery powered only so I added a 9V adapter.
2. For lower weight measurements (such as powder), I run the quick 1 point calibration (use the 20 gram weight). Then put on the powder pan and rezero.
3. I verify the scale itself with a check weight 3 times during a reloading session. After the initial cal, in the middle and at the end.
Since it is much faster than a balance, I check my metered charges more often than I would with a balance beam. I think this alone makes it worth it.
For powder measurements I use the powder pan. For best measurements for bullets, etc. make sure the item is centered and not placed near the edge of the platen.
Digital scales can be sensitive to drafts and vibrations like a balance beam, However they are also affected by strong EM fields (do not operate near things like power supplies or TV sets).
It is poor for trickling charges (use a balance beam here). The measurements "lock in" and do not respond to small changes. However it easily beats a balance beam for weighing and segregating a bunch of items (like cast bullets).
There is no auto-off on this model. That would be a very annoying feature for a precise reloading scale that should be calibrated.
In the final analysis, it does not do anything a balance won't do except it can save a lot of time and also encourage you to check your charges more often. - Phil