I have applied AIO with a PC (and a waxmaster) and a foam pad, but I ended up using a LOT more product compared to applying by hand with a microfiber pad. I did this on 2 cars that didn't get a very good prep job before AIO application, and I feel that the PC application of AIO did a lot better job of cleaning the paint than a hand application would have. The only drawback to PC application (in my case) was that I used more product, and had more dry residue to wipe off.
I personally would not apply SG with a PC -- based on my experience with the AIO/PC, I would end up putting way too much on. Others may be better with the PC though...