I'm not a big fan (nor big opponent) or Rollerguards as it is, but the Bowturbo is an accident waiting to happen.

Bows that have an factory rollerguard are approriately beefed up generally (as regards to limbs).

Standard Cable guards (whether carbon or alum or steel) were NOT meant to handle the stress the bowturbo puts on it (nor have a set screw wrenched down on it) - they will break in time under that kind of stress/deflection and chances are it will happen at full draw as mentioned. Having undergone a bow flying apart at full draw a few weeks back, I'm more leery than ever about this kind of thing- I was lucky and only got dinged up a little as everything derailed. Do I want to push my luck by adding additional stress to the bow system?