I have a bunch of baggies of blue discs from Vince's and a homemade inertia sander (using the magnetic ball bushing from Eddie Castelin and a Napa auto parts store Velcro sanding disc holder). I also have both handheld cordless and corded drills, but I find the weight unwieldy. So far, I haven't turned anything bigger than 12" diameter, so I find the inertia sander, combined with a bit of elbow grease works just fine.
At the Pittsburgh symposium just a few months ago, I bought another disc holder pad from both Vince's and from Ken Rizza (Woodturners Wonders), and several feet of Abranet in assorted grits from Steve's (turningwood.com). The intention is to use the abranet with elbow grease (not to be confused with turner's elbow; please don't ask me how I know about turner's elbow--almost always the right elbow).
I don't get an endorsement compensation, but I am happy with all these products, and the gentlemen who sell them.
Hy