Our short-shifter will have less movement than the one in the ebay picture.
One we have moved the actual pivot point further up the gearstick shaft, meaning a shorter fore-and-aft throw to change between gears up and down, but left the normal side-to-side action to prevent wrong gear changes.
We have also removed the third gear cable that is shown in the ebay pic for the reverse inhibitor and made our own hinged inhibitor so it inhibits at the gearstick side, not gearbox side, as it is on MPi Seicento's as standard. You then stick a blanking plug over the 3rd cable hole on the gearbox side as per all later model Fiat's with FIRE gearboxs. It also means one less hole to cut in the bulkhead when running the gear cables through it.
Then we have shortened the gearstick overall, this shortens all movements, fore-and-aft, and side-to-side, but not to short so that it's much closer to the steering wheel so less time between hand moving from steering wheel to the gearstick.
The ebay picture one has the cables in standard positions so the actual movement is no shorter, and it has retained the original reverse inhibitor, so therefore overall length of the gearstick is the same, it will be no quicker than standard as far as I can make out from those pictures. The only differance I can see that ebay one making is moving the gearstick closer to the steering wheel, there will be no improvment in shift quality or speed.
If you have this change I suggest you grind off the pivot on the gear-shaft, and then move it up at least 20mm re-weld it back on, this will greatly reduce fore and aft movements making it a quick shift. Though you will need to modify the box it sits in as the cable will now be higher. Look again at ours, we have used original Cinq box that hangs below the car, brought it inside but fabricated a bracket that sits proud of the box to let the cable sit effectively outside the original box, giving a straight run to the moved pivot point.
Ebay one so you can hopefully see what I mean.