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I worry that there might be difficulties leaning over and picking things up without the chair moving.

Imagine dropping something and instinctively leaning over to catch / retrieve it.

The Q&A video https://www.youtube.com/watch?v=ThwLzeEpP5I shows a switch which disables side-to-side movement (and a joystick which can be used to turn when lean-to-turn is disabled).

Me too, in the video they show an operator scooping a basket ball off the floor without effecting his direction of travel, but I wonder how hard that is to do in an instinctive way.

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