If your lenses work with the turret, it is useful. I've run into problems in the past with an Omega turret where I could not simultaneously use the turret and use the 150mm lens I wanted, and a different situation where I could use the lens in the turret but couldn't rotate the turret around with the lens mounted.
If it works, more power to you, but at this point I suspect they only really work for 35mm and some 120, and so I've stuck with boards for my Beselers. One nice thing is that the 45 and 23C boards are cross compatible (just about the only thing that is, ahem), so you only need to mount them once.