Having looked at a lot of reviews and posts, in the high end you seem to get what you pay for. Probably the most reliable is the
Prometheus Gen 2, as it depends on a precision mechanical balance that can't drift or go out of calibration. But the $3800 price tag is generally beyond most people's willingness to invest in one.
The Auto-trickler, by the time you have it and
the scale is currently the next most expensive setup, at about $1100 when you shop around, but their recommended type of scale settles faster and drifts less than the conventional strain gauge electronic scales and has more resolution. The new RCBS Matchmaster ($900 on sale at Midway) is the first attempt by a well-known reloading name to get into the higher resolution (better than 0.1 grain) electronic scale versions of these devices, but I haven't heard how any users feel it compares to the other two I mentioned first.
After that, based on recent conversations here, the RCBS ChargeMaster Lite seems to be very popular. But I can find threads on various forums where people complain about getting examples of every brand that didn't work out well for them and others with examples of every brand that did work well for them. Consistent, stable performance and reasonable dispensing speeds are the combination folks desire, but the scale components seem often to have difficulty delivering. That part still seems to be a roll of the dice to some extent. So, if you buy one, just be prepared they sometimes have to be exchanged until you get one that behaves.