When comparing Model M vs Unicomp Ultra Classic Buckling Spring, 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 Unicomp Ultra Classic Buckling Spring is ranked 52nd. 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 Quieter than Das keyboards
Pro Keys feel nice
This keyboard uses buckling spring key switches, the same used on the famous Model M keyboard, from IBM. This mechanism gives a nice feel to the keys.
Pro Resistant
Due to its good construction, this keyboard is very resistant.
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.
Con Takes a lot of desk space
The Unicomp Classic is huge, so it takes a lot of space on one's workspace.
Con Ugly
This keyboard doesn't look very aesthetically pleasant.