I've installed driver floorboard spacers on my last 3 touring bikes, so it was a no-brainer to pick up a set from Kuryakyn for my RGU. I've bought Kury's before so I didn't have a problem buying them again this time. They are robust and I have no worries about a part failure with them.
I believe they retail for $39.95, but I paid $33 and change delivered, so I thought I did well.
Installation is a snap unless you get a kit that's been on their shelves for a while, which I did. Mine came with a total of 6 replacement bolts (when only 4 are needed), and some screwball instructions for CVO owners about installing the bolts from the inside of the frame, which would necessitate engine removal! I wrote Kuryakyn customer support and told them thanks for the extra bolts, but would they kindly purge their system of the old instructions. They sent me a PDF of their "newer" instructions, but they were still incorrect, so I let them know that again. I never heard back from them. I suppose my email ended up in their "pest" collection.
Anyway, in about 20+ minutes you can easily have these spacers installed with a few simple tools, and if you've never put a set I need to tell you that they make several positive changes for the driver:
First, your boot and lower leg are moved out 3/4" more into the slipstream and away from the very hot engine and exhaust.
Second, your legs/feet are now able to spread apart a total of 1-1/2 inches more than before. This may not sound like much but it does provide for a much more comfortable stance while riding.
Lastly, you now have a little more room to maneuver a large boot around those shifter or brake levers.
As far as new bike ergonomic changes, this is one of the first and least expensive changes I like to make. It's also one of the most helpful and comfortable for the little money you'll shell out for the kit.