I've played to click tracks for many years (we used taped horn sections, live, way before MIDI was around) and I want to point out one key issue. A sharp sound (metronome, stick sample, etc.) can cause ear damage (I've lost almost complete hearing in one ear from click tracks) - in particular in a live setting, where you may need to click louder.
These days I prefer tambourine or cabasa sounds which are "smoother " with less impact.
However, although not as significant from a health stand-point - on a practical basis, using a drum machine to create a "groove" (more than one sound) rather than a click, provides a much more user friendly "pattern" to play to.
This way you can play with a groove rather than being controlled by a click.