I agree with Lloyd. Buy a quality one to start with. However any one can have problems. In electronics life expectancy is usually long. If there is going to be a problem, it will usually rear it's ugly head soon after putting it into service. ESD (electro Static Discharge) has ruined more electronics than any thing else. This is a little spark that jumps from you to the electronic component - it will kill it or severely shorten it's life. As the electronics industry has matured, they have a better understanding of ESD and it's prevention. So if you get a scale run it through a burn in period - leave it on for at least 30 days to see if any components will fail. Chances are, if it makes it through this, you will be good to go.
Personally, the only electronic scale I own is part of a RCBS combo powder measure. I still use a beam scale; I have had for quite some time.
You said that you wanted it for field work at an outside loading bench. "The scale will make trips to the range for load work-up." In my experience an electronic scale or a beam scale, for that manner, is not much good for outdoor use. Any air current will totally mess up your readings. I know boxes have been made to isolate air currents, but they can be a pain in the neck to open the box, weigh a charge, open the box back up to take it out. Next shot - repeat. Most of the people that do load development out doors, use a quality powder thrower. One that has a scale on it. They know a head of time how much powder it will throw at a certain scale reading. These folks rarely push the pressure limits of their cases either. They generally are expensive and they make them last as long as possible. If you really plan on doing load development at the loading bench, just beware of these problems before you start. I know a few that have enclosed trailers, that they do their load developing in. I am lucky in the fact that I have a 100 yard shooting range in my back yard, so I load up a series of loads and go shooting. I can then take down the ones that did not work out. I re-size the necks and try a new load or new bullet in them. Go back outside and do some more shooting. I continue to do this until I hit the magic load. I can usually do this in an afternoon, if the gun is not real picky.
Good Luck and Good Shooting