Yes the electronic dispensers are often out by 0.1gr. Then again, most throwers will be out by more than this (facilitating the need to secondarily trickle as many here have highlighted). My goal is to "automate everything", and the electronic dispenser does away with the need to secondarily trickle.
Unless you are competing in higher-than-club level F-class, I can assure you 0.1gr is a fairly insignificant variance. I've been told by high level competitors from both F and TR camps that so long as you are on your harmonic "sweet spot", up to a 0.5gr variance is pretty hard to observe. I don't allow that much personally, but I'm not at
all worried about 0.1gr variance.
I will use a thrower when the match I am preparing for does not demand a high level of precision, and just stomach the variance. Which is pretty much all of club-level Service Rifle
Supported, scoped-rifle matches, I use the Electronic because 95% of dispenses are under 0.1gr, which is just fine for long range.