I have one of the Girots 3" units, but it offers no advantage over a Porter Cable with 3" Lake County or similar pad and backing plate. Just makes you own two buffers that do the same thing, only the PC will run a large pad as well, the Girot will not, at least not for very long because it does not have the power, not a bad unit, just better stuff is available - cheaper.
As far as a post above using a small pad to cut down on wax sling.. wax sling NEVER happens, you do not squirt wax on a car or bike or the buffing pad then set the buffer down and turn it on. On any quality detail you massage the product into the pad, using your fingers or if you are really anal a plastic paddle - evenly before you start and you start the buffer while in contact with the paint. I do not sling wax and do my bike, and others with 7.5" pad regularly. I find the larger pad, on a bike much easier to use because you keep the actual buffer unit it self farther away from the bike, also a piece of rubber pipe insulation slipped over the buffer body keeps mishaps to a point where no maring is possible. Just my opinion and experience but not really worth much if anything.