I use the one that came with my desktop. I notice no 'fatigue' when having to press the keys on my bubble-style keyboard. I guess that 'fatigue' only applies to people where 2mm pressing distance actually changes their day.
When I type I hit my keys nice and hard, it's jsut the way I have always typed and I am happy with it.
I also type with my index and middle fingers of both hands and can do 60-80 words per minute.
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