Worth the money? - that's something that each individual must decide after using it. I like mine, but there are lots of people who don't, judging from posts I've read.
The kit is well manufactured - so for pure value of components, I have to give BD a thumbs-up. The parts are well machined, and everything fits nicely. (except for one minor problem - read further)
Just be aware that with the reduced shifter throw also comes an increase in force needed to move the lever. It's because the laws of physics won't be denied. If your NV5600 exhibits any "notchiness", or you feel the "detents" when your synchronizers engage, the BD Short Shift kit will emphasize those sensations in your shifting.
After driving mine for a long while, I've become used to the quirkiness of the NV5600 shifting, and it has become second nature to sort of "float" the lever into the required direction. I really do enjoy the decreased shift lever travel - I can shift by just moving my wrist. Before, it was like winding up for a baseball pitch, even taking my shoulder away from the seat. (Well, that might be a LITTLE bit of exagerration, but you get the point. )
What this shifter WON'T do for you? You can't speed shift. Of course, most all NV5600 owners already know this. The BD Short Shift won't get you any better times at the dragstrip.
Also note - when I first installed my shifter, the bend angles weren't exactly like my OEM shifter, and the lever was moved too close to the seat. I actually had to lift my center seatback up so I could grab the lever when in 2nd/4th/6th gears. The shift lever was so low (toward the seat) that the seatback interfered with my arm. BD replaced the rod with another, and the angles were corrected.
You might like it - you might not.
John