Not me, but interesting video from the interweb.
General consensus on forum is that "probeam only" is help for stability while maintaining soft ride. Backbone is less necessary and some claim soft ride suffers after install.Living in SE Florida, there isn't much chance to drive inclines, twisting roads etc. Would a backbone only make much difference to the ride and if it provides an advantage, which thickness would be best? I prefer a softer ride but if it helps with chassis stability and not sacrifice ride quality then I would be interested in installing one.
My LS does that for me. >As others stated the answer is yes - buy them. I planned on getting the bundle from DDM but while at NASSAM this last year PAW had a "scratched" backbone for a great deal. I got it first, then did the pro-beam, and then lastly the venom bar. As a noteworthy mention - my father was smarter than me and measured his front frame width prior to installing his venom bar. After installation he saw that the frame pulled together a little bit (I forget the exact measurements). I'm not saying that the venom bar made a drastic difference to my handling, but it seems to tie the right and left frames together solidly.