Steve,
I've used a Porter Cable detail sander for years, with good results. the reason I chose that tool over the Feins, and Festools was because you get a bunch of different sanding profiles with the tool and it's VERY easy to cobble up custom pieces of rubber that will easily attach to it's body. NO proprietary add ons are necessary.It is very handy to get into those difficult places on a boat that won't accommodate other sanders. BUT I have never used it for 100%duty cycle type of work where I did batches of parts all day long. Maybe if someone else on the Forum has run it all day they can comment on it's performance.
"Share your knowledge. It is a way to achieve immortality"...The Dalai Lama
"Nothing is really work unless you would rather be doing something else....." Sir James Barrie