Short shifter or not ?

[The Radium King]

it'll make existing problems with your transmission worse. ie, if you are having problems getting into second it'll be tougher getting into second with the short shifter.

if you want to spend a lot check out numeric racing.

[trimer]

Did not have it in my 02 and it was already installed in my 03 and I absolutely love it and would never go back to original. I have the original in the box used for about 5000 miles and it will sit until I sell it. Makes my driving experience that much better

[CT986S]

I went from stock in my 01 S, to a 997, now have the current B&M. Having done that, and similar in my Miata, I can say the comment that it will magnify any flaws is correct. Yes, the pattern is shorter, but stiffer/notchier. You have figure out where the balance is for you.
For me, the shift from 2nd to 3rd is now a thing of beauty, much improved over stock. The others are shorter but stiffer, and I like the balance.
See if you can try different ones in friends cars.