Just a note about the difference between Mike's replacement stick and the original. As a disclaimer, the reunion base is widely regarded as the best 4-way microswitch on the market, and Mike's addition of a DK style ball top makes this joystick a good cosmetic substitute. I don't want anyone to think that I am bicking on this product or Mike, because I am not; this is probably the best NEW replacement you will find.
I have a regular reunion stick, and I will probably end up selling it someday, It just does not feel anything like the old sticks. Not just DK, but pacman and other old games as well. I did not think there would be much of a difference and I planned to only use Happs (I quess IL now that Happs is not using theirs) for all of the games. It just did not work on the classics for me. Now I understand why people love the wicos, they are a much better (IMHO) stick for the classics than the reunion stick. If you need one 4-way stick for the classics, this would be my choice. If you are like me, and you spent way too much of your teenage life playing DK, then you will never really be happy with anything but the original stick. With the wico stick I am now scoring in the 80,000s (after at least 15 years of not playing, I am pretty happy with that for now), so the stick is as capable as the original. It requires more force to use, and I do miss the easy and rapid movements of the old nintendo sticks. Once I remember how to get past the 3rd elevators, I will really appreciate the light spring in the nintendo stick, because games can get pretty long.
If you never played DK, you will probably be fine using Mike's reunion stick. My girlfriend is about 10 years younger than me, and she prefers the newer sticks, where I find them unusable. Choose whatever works for you. I just want everyone to understand that this stick is a cosmetic replacement for the original, it will not replicate the feel.