The ProtoArc EM05 NL pairs a thumb-driven trackball with a vertical ergonomic shell and programmable buttons (onboard sensitivity toggle mentioned). It’s strong for cramped desks and forearm-rest ergonomics but has a noticeable thumb-learning curve and awkward scroll-wheel placement — good as an ergonomic productivity peripheral, mediocre for users expecting a plug-and-play palm mouse.
Buy if you need a space-saving, forearm-resting vertical trackball and can invest time training thumb control; avoid if you want traditional scroll placement or immediate plug-and-play comfort.
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