The reviews on Amazon speak for themselves, I think.
Part of the problem is that SOG's inside tools have always been pretty lackluster in execution. Their files are subpar, the scissors are terrible, and the screwdrivers are poorly sized. The PowerGrab uses mostly SOG's older implements, with the only new things being the big knife blades, which other than being longer than standard implements, don't offer much in improvements, since SOG's knife blades have always been better than other manufacturers.
SOG's pliers have always been their big selling point (and even both bad Amazon reviews admit they are great), but lets be brutally honest, if it weren't for how good they were, SOG would have stopped making multitools a long time ago. They have always done well with innovation, but their execution is often so bad it ruins perfectly great designs. Tthe PowerDuo is a great example of a great idea executed extremly poorly.
The screwdriver bit holder in SOGs new tools was a brilliant move, and its secondary function as a "gear guard" addresses a longtime flaw with SOGs compound leverage design, but it also makes the PowerGrab's inclusion of a 1/4" socket adapter (which mostly was used for holding hex screwdriver bits) very questionable. The real reason they included it is because they don't have any other old tools, and SOG didn't design any new implements to take up the space. At least they didn't put two fat washers in there though.