i have the inokinetic shiftr111 package with cables and reinforcer along with a letsla short shifter. The IK parts contributed to probably 70% of the shift feel improvement - I did the letsla last and it really put it over the top. All parts as a complete kit completely transformed the driving experience - if I could do it all over again it would be one of my first mods for sure.
Our short throw kit is installed at the gearbox and is fixed for simplicity/reliability. Ours offers a 19% reduction - which I think is perfect as these gearboxes do not like really fast shifts. This reduction is noticeable in throw length and helps reduce slop in the throw. See it: here
You can watch the install video (starts at 1:45min): HERE