I do marble and stone refinishing and polishing. This machine is great and I use it on every job. I use it mostly on low to medium speeds, and it has great torque. The pads are the same as the 5 inch Rival pads that I order from the supply store I order things from. Some people may complain about getting an electricity shock from it, but as long as you use the protective rubber guard that comes with it, and keep water out of the motor housing, you should have no issues.

I have only used it once, but I polished 410 sq feet of concrete countertop and it worked really well. The hose adapter leaked a little, but the floor is covered in water when you're done anyway, so it doesn't really matter.

I have polished more than 500 baseball & softball size rock specimens. There are 9 stages of grit polishing per rock. I've had to disconnect the variable speed switch as soon as moisture got to it and use full speed only. That's a good thing. It has very good power. I've replaced the water valve and that's all I have done as far as repairs. After all the polishing it has done, it looks like a piece of junk but it's still going strong. I have bought a second one to keep on hand thinking this one would have died before now, but it hasn't. Good Machine.

I have to admit that I have never polished a lick of concrete before tackling the poured-in-place counter top for my outdoor kitchen currently under construction. I don't fancy myself a concrete finisher, so I was a little concerned about the imperfections I would need to overcome. As a DIY'er, the cost of granite was excruciatingly ridiculous so I decided to save some bucks, try something different and get a new tool to boot! After reading several reviews, I kept coming back to the DAMO Diamond Tools 4" concrete polisher. I'm glad I did. The price was right, it came with all of the graduated grinding pads I needed to polished my hunk of concrete to a silky smooth consistency and it really was relatively easy to use. The project came out great. I also give DAMO big kudos for standing behind their product. During the grind, I tripped my GFI outlet and set my new grinder down to go reset the breaker. Unfortunately, I forgot to turn the tool to off and once electricity was restored it spun off the counter and the handle was broken. DAMO sent me out a replacement part within a few days...no charge! Great grinder from a great company.

Works great!