I have spent over 30 hrs using one. The vibration is really bad my joints hurt for 2 days after using it for just a day. That being said yes they are pad eaters, and the really like the pads HF sells you will be lucky to get through your project with those. I bought lake county pads and well it likes them as well, but they do last a little longer. The machine is really loud so if you buy wear some ear protection. The speed control moves really easy so while you are polishing you have to keep resetting it. The power button is rather bad place and hard to turn on and off.
Now with all that if this is for a hobby or you are just starting out in business it may be the way to go so you can purchase other tools and materials that you need. Beware it does not cut quick like you better machines so if you trying to make money you might want to increase the budget for your DA and cut back in another area, a quality DA will make you more money to upgrade whatever you downgrade now.
This was my experience, I started out with a HF DA and regretted ever minute. Also remember you by the better pads you will spend more on pad replacement than you would just going ahead and purchasing a quality DA.