Mine has an auto-off function, but I never had a problem with it. I weigh out the grains one after another, and then the extract in normally two sessions as the bowl on it only holds about 2kg DME. It weighs to the nearst 1g, so it pretty good with the hops too. Small, tidy, and easy to read in the "stress" of a busy brew day <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="

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As long as you don't walk off for a few minutes in the middle of weighing something, there's no hassle.
Mine also has a zero-setting function which is useful if you want to weigh a few things into the same bowl. Weigh out a couple hundred grams of grain, hit the re-zero button, then weigh out some different grains. Saves having to use the brain to do the maths <!-- s;) --><img src="{SMILIES_PATH}/icon_wink.gif" alt="

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All personal preference of course.