When comparing Model M vs Truly Ergonomic 209, the Slant community recommends Model M for most people. In the question“What are the best keyboards for programming?” Model M is ranked 14th while Truly Ergonomic 209 is ranked 44th. The most important reason people chose Model M is:
Buckling-spring switches are hardly used anymore, but they give some of the best tactile response when activated.
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Pros
Pro Tactile and "clicky" buckling-spring key switches
Buckling-spring switches are hardly used anymore, but they give some of the best tactile response when activated.
Pro Very sturdy
Although heavier than a modern keyboard, this keyboard is built like a tank. There is no flex, and the components were built to last.
Pro Solid construction
Quality construction, good materials.
Pro Clear separation of key groups
Pro Attitude
Clearly signals that I'm serious about what I do and how I do it.
Pro Removable / replaceable keycaps.
With a hook beneath the caps that you have to get to, you can detach those keycaps and replace them with others.
Pro Blank keys look sly
The 209 comes with blank keycaps, which looks great. It also helps learning how to touch type.
Pro Comfortable and ergonomic
The 209 is designed ergonomically, so it fits user's hands naturally, making it comfortable to use.
Pro Non-staggered keys for easier typing
This keyboard's keys are arranged in a non-staggered way. This allows for a more efficient, easier typing process.
Pro Key layout customization
The 209 key layout can be altered: users can move functions between keys as they please. Settings are firmware-saved, so they apply even if the keyboard is moved to a different computer.
Cons
Con Noisy to type on
Floss mod is available for the Type M to make the keyboard a little more quiet. However, since it's still a mechanical keyboard, it will be noisy. This keyboard will not be appreciated in the office.
Con Very hard to acquire
Out of stock for decades.
Con Ugly as hell
Con Some driver issues with USB-only computers
Using a PS/2 to USB adapter can kill rollover.
Con Very large
Measuring nearly 20'' x 8.5'' x 2" ( 50 x 21.5 x 5 cm), this is a very big keyboard. It will be hard to fit into a minimalistic styled desk setup, and might even be too big for some smaller desks.
Con Lacks some modifier keys
The Model M lacks both of the meta/super/cmd/Windows (depending on the OS in question) keys and a menu key.