enertia or random elliptical sanders
With these sort of sanders you need speed and they are not suited to every application. I do mainly bowls and have found them very handy.In fact I have 4-5 of them right down to the smallest with a 1" head for sanding inside small HF bowls. Having seen Johns mirrors I not surprised they dont work effectively for him.
But as I said you need speed to drive them effectively, I typically sand around 800-1200 rpm on my bowls etc.This gives the driving power required to sand effectively.
Theres a few tricks to getting the best out of them, one is to cut your paper an 1/8 to 1/4wider than the sanding pad. This protects the velcro pad from the feathering effect as you work across your job.
Ok you will get heat build up, but I rarely have enought heat to split or crack the bowl as yet and internally I often use compressed air to blow out the dust and cool at the same time.If I place the shop vac in the right place it darn near gets all the dust as it comes out.