Hi all,
Since I'm running many of the parts I sell on my shop car, I thought I could share some of my thoughts about them.
First, I'd like to talk about the Nielex Short Shifter Kit. I installed it about a year and half ago. I love it SO much. It makes the gears so much shorter, you can change them just by using 1 finger. The height of the shift knob is adjustable, so you can even keep the OEM shifter height while having a shorter throw. I myself tried many setups and kept the OEM height. The short shift kit comes with brand new bushing and makes your car shift better than new. The shifter also feels much more rigid (less sloppy).
Second, I'd like to tell you that the Beatrush Shifter Collar is totally worth it. It's a cheap piece that makes shifting even more precise. The 2nd-to-3rd gear shift is now always perfect and even more easier. It makes the shifter more rigid combined with Nielex Short Shifter Kit. Even without the short shift kit, customers tell me it's a very useful part if you're racing.
Finally, I recently installed a Nardi Evolution Shift Knob in my shop car. God this shifter is nice. I previously had an OEM Mazda3 Shift Knob (heavy) and this one feels SO much better. It's actually the same one as the ones that came in 1991 BRG Miatas. It's very light, but the shape of it makes it perfect for our vehicles. It's available in dark wood, light wood (same as 1991 BRG) and leather. I installed the dark wood version in my vehicle.
Now, let's show a few pictures (only the shift knob can be seen...) :

I'll add more pictures of the shift knob in future posts as I'm switching for the leather version in a few weeks.
I hope you enjoyed the review, here are some useful links:
http://www.rev9autosport.com/beatrush-shifter-collar.html
http://www.rev9autosport.com/nielex-short-shift-kit.html