Give me a break. I have found dozens (no, not hundreds, like some) with an eX200 and I've had no problem entering coords accurately. It's simply a matter of looking at the numbers you've keyed in before hitting Enter.
I hope you're not an accountant.
(sorry to sound confrontational, but give people credit for having the brains to perform a simple task)
Actually it is quite simple for use geniuses to make the coordinates enter wrong.
I found a couple hundred caches with a mag 315 and entered them all by hand. One day i crossed up 2 numbers and was about 300 feet off. i have a brain and i use it.
laws of probability dictates that sooner or later you will screw up.