The following information contains ONLY the facts.
All data contained herein can be reproduce by anyone, anytime, anywhere.
Here is what both kits contain. JBARONE on the left, JSPEED on the right.

Back side of both. JBARONE on the left, JSPEED on the right.

Front side of both. JBARONE on the left, JSPEED on the right.

JSPEED ball stud removed.
Locktite appears to be applied, only 4 threads in to the plate.
Locktite appears to be applied, only 4 threads in to the plate.

This next picture is very important as I will now reveal the exact throw reduction of both the
JBARONE and JSPEED short throw shift plates.
JBARONE and JSPEED short throw shift plates.

Out to the shop for installation
Test vehicle is a 2009 MAZDASPEED 3
Test vehicle is a 2009 MAZDASPEED 3
All measurements were taken from same location of the dash to the center line of the shift knob.
In the stock configuration the shifter travels 2.0" from neutral to the top of
3rd gear. The next shot is of the stock configuration in 3rd gear.
3rd gear. The next shot is of the stock configuration in 3rd gear.
Neutral is at 6.75"
3rd is at 4.75"
Difference of 2.0"
3rd is at 4.75"
Difference of 2.0"

A shot of the JSPEED installed.

With the JSPEED installed the shifter travel
from neutral to the top of 3rd is 1.625". The next shot is of the JSPEED in 3rd.
from neutral to the top of 3rd is 1.625". The next shot is of the JSPEED in 3rd.
Neutral is at 6.625"
3rd is at 5"
Difference of 1.625"
3rd is at 5"
Difference of 1.625"

A shot of JBARONE installed.

With the JBARONE installed the shifter travel
from neutral to the top of 3rd is 1.25". The next shot is of the JBARONE in 3rd.
from neutral to the top of 3rd is 1.25". The next shot is of the JBARONE in 3rd.
Neutral is at 6.625"
3rd is at 5.375"
Difference of 1.25"
3rd is at 5.375"
Difference of 1.25"

Now the math
JSPEED
1.625 to go in to 3rd gear.
1.625 is 81.25% of 2
100%-81.25%=18.75%
1.625 is 81.25% of 2
100%-81.25%=18.75%
The JSPEED STSP reduces the throw by 18.75%
JBARONE
1.25 to go in to 3rd gear.
1.25 is 62.5% of 2
100%-62.5%=37.5%
1.25 is 62.5% of 2
100%-62.5%=37.5%
The JBARONE STSP reduces the throw by 37.5%
Other useful information
JSPEED
Cost - $55.00 USD
Contents of kit:
1 - Short Throw Shift Plate (1.2oz.) Brushed Finish
1 - Installation instructions
The JSPEED STSP is constructed out of 0.250" (1/4") thick 6061-T6 plate.
6061-T6 Aluminum
Physical and Mechanical Properties Courtesy of Wikipedia
Ultimate Tensile Strength, psi 45,000
Yield Strength, psi 40,000
Elongation 8%
Rockwell Hardness B60
Chemistry
Aluminum (Al) 95.8 - 98.6%
Chromium (Cr) 0.04 - 0.35%
Copper (Cu) 0.15 - 0.40%
Iron (Fe) 0.70%
Magnesium (Mg) 0.8 - 1.2%
Manganese (Mn) 0.15% max
Silicon (Si) 0.4 - 0.8%
Zinc (Zn) 0.25%
JBARONE:
Cost - $80.00 USD
Contents of kit:
1 - Short Throw Shift Plate (5.4oz.) Powder Coated Finish
1 - Shift Weight (12.6oz) Stock weight is 19.4oz. Powder Coated Finish
2 - 8mm x 1.25 x 25mm Stainless Hex Cap Bolts
2 - 8mm Stainless Lock Washers
1 - 5ml Capsule of Loctite 262 Permanent Thread Locker
1 - 1ml Capsule of Super Lube Industrial Synthetic Lubricant
1 - Installation Instructions
The JBARONE STSP is constructed out of 0.1875" (3/16") thick 1018 mild steel plate.
The JBARONE Shift Weight is constructed out of 1"x2"x1.5" thick 1018 mild steel bar.
1018 Mild Steel
Physical and Mechanical Properties Courtesy of Wikipedia
Ultimate Tensile Strength, psi 63,800
Yield Strength, psi 53,700
Elongation 15.0%
Rockwell Hardness B71
Chemistry
Iron (Fe) 98.81 - 99.26%
Carbon (C) 0.18%
Manganese (Mn) 0.6 - 0.9%
Phosphorus (P) 0.04% max
Sulfur (S) 0.05% max
I hope the information here can help those interested in either product make a more educated decision.
Thanks,
Jamie