I was surprised to find someone endorse the Oreck recently, in glowing terms, but it's only a domestic tool and as you say, very light, also, the orbiting action is too restrictive ( it's only 12 inches across )
I purchased one about 5 years ago, hoping it would be suitable for domestic work............it was'nt and simply doesn't compare to the bigger rotaries.
If you want a ( smaller rotary ) there are plenty around, with the necessary weight and power to do the job properly.
I've used the Texatherm system and Charley pads, plus rotary with brushes and the Oreck simply doesn't come close.
This, of course, is only my opinion, but, I binned the Oreck, which I would never have done, had I felt it might be useful !!!!!!!!!!