once you've used a good mechanical keyboard i'd like to say you never go back, however we know this just isnt true. i can say however that i do prefer them over rubber dome type switches.
the keys are not spongey, have tactile feedback when the key is "pressed" (a click normally), and come in audible and non-audible versions. i can honestly say i type better and more accurately than i do on a rubber dome type keyboard.
just my opinion but i'd go with a unicomp.