I gave FBV a serious shot for months. Sent in runners numerous times to NoIcing so I know I was getting a quality cut. I went back to roh and was a stronger skater although I could feel the slight loss of glide. Then I got a sparx sharpener and have been pleased the FIRE cut. For me, The feeling FIRE gave me on my skates was in-between FBV and roh. I switch back and forth sometime between 5/6 fire and 11/16" ROH.
From my understanding, the tolerances are higher for FIRE whereas the tolerances for fbv are super low. If you're not getting your runners cut by extremely experienced and meticulous sharpener like NoIcing, I suggest sticking with FIRE. Your edges have to be close to dead even for a proper FBV cut. Moreover, sparx did a study testing numerous runners and holders. Almost all had some bend to them either due to the runner having a bend, the holder bending the runner, or both. The higher end runners like step having minimal. Even with the slightest bend fbv will lack an edge somewhere down the runner due to the low tolerance. This is why I take my runners out of the holder when sharpening for any grind just cause its very easy with the tuuk edge holders and it eliminates that variable. This is my opinion through my own research. Take it for what its worth, but I suggest you do your own research on fbv, tolerances, bends in runners/holders, ect.
If you are going to stick with FBV, I would have no one else but NoIcing sharpen your runners. I tried a couple LHS that I let FBV cut my spare runners when my main set was out at NoIcing. When trying them I would randomly hit the deck cause of no edge.
For what its worth, I can get my runner's edges after a Sparx fire cut down to what I believe is two ten-thousandths off when checking them with my HDI.