No experience with electronic dispensers.
But I have 2 digital scales, a Pact BBKII & a Cabela's XT 1500.
Also have a Lyman/Ohaus beam scale.
All 3 are within +/-.01gr.
So I'd say they're spot on.
I think any digital scale that's $75 on up are OK.
I know some have a $20 Franklin scale & are happy, but I wouldn't trust 'em.
Lowest charge I throw is 2.0 gr of Titegroup for 32 S&W Long.
Largest is 26.0 gr Varget for .233 Remington.
No problems with measuring any charge on all 3 scales.