Besides longevity (ie sample defects), the main issue with dispenser/scales comes from the scale. All of the digital scales under ~$500 share the same basic technology, ie strain gauge load cells. The most significant issue with that tech is that the cells respond to RF noise.
That noise can come from the power line itself (my PACT reacted any time either of its two power cords moved), and more likely over the air from anything that transmits (my PACT and Chargemaster reacted to those). That includes cell phones, WiFi, wireless phones, microwaves, motors, some A/V equipment, most fluorescent lamps, and more. When hit by that noise they will flutter, lose zero, weigh the same object differently.etc.
If you reload in a noise-free environment they may work OK for you, likely delivering +/- 0.06gr from target 80% of the time when they do not overthrow. The remaining throws will likely be +/-0.12gr with 1 or 2 per hundred outside those bounds.
That is in part why some people give these dispenser scales positive reviews while many others eventually give up on them. Those who give up either return to beam scales or buy the AutoTrickler (and perhaps AutoThrower) which are attachments to higher quality scales the least expensive of which is the A&D FX120i which can be purchased for ~$525. To that you can add the price of one or both of the "Auto" attachments.
That system (eg my A&D FX120i) does not react to noise and can deliver +/- 0.02gr from target or +/- 1 kernel, whichever is larger, consistently. Any dispenser scale can and will overthrow the target range for several unavoidable practical reasons, but this system allows you to simply scoop out a small amount of powder and it will do the final trickle-up again.
TLDR: The lower cost dispenser scales may or may not work well for you, and when they work they may not deliver the precision you personally want. Note that small variations can be especially important throwing light powder charges (up to and including typical 223/556 charge weights) depending again on your personal tolerance. Or they may not matter to you at all.