 Mechanical key switches are luxuriously tactile. They're also quite large. For a similar mechanical feel with less chunkiness, there is the chalk switch. These switches are relatively spelt at nearly half the depth of the standard Cherry MX design, yet they still manage to provide a satisfying mechanical feel. Chalk switches have a unique pin arrangement and stem, so they can't be used with Cherry MX PCBs or keycaps. But if you have a space constrained project that would benefit from an upgraded interface, or you just want to build a flatter keyboard, these are a great way to go.