Why do the 3M keyboard trays cost so much more than the others?

The 3M trays are positioned as premium ergonomic mounts with track-mounted height and tilt adjustment, swivel, and included gel wrist rests, which is reflected in pricing several times higher than clamp-on trays. Verified-purchase ratings on the 3M models are solid but lower in volume and slightly lower in average than the high-volume budget VIVO and BONTEC trays, so the premium buys adjustability rather than a clear consensus quality edge.