I use the Golem BOV on my O2ptima, and while I haven't tried it deeper than 130' yet, it performs well at that depth. Tried a few different breathing rates and all worked well.
Perhaps DiveRite is looking to supply their own BOV in time, and they just don't want everyone to already have one.
Richie
That may be the case.
It is probably a R&D project at every manuf to provide a factory BOV option. If not, they are just handing revenue and safety over to 3rd parties.