I bought a HF DA last year, started it up and after using it for a few minutes threw away the backing plate that it came with and replaced it with a LC 5.5" backing plate. I also turned the on/off switch to the top and added better grease to the gears. It has more power than my PC and I use it for corrections now. My PC I use with 4" pads. For my needs it runs better than the PC.