We have not long had our floors polished and overall I would say it was a disappointing experience with mixed results

We paid for it to be done by so called "professionals" and they damaged our freshly painted walls with their heavy sanding equipment, missed filling quite a number of nail holes in one area of the unit, missed a patch with the top polyurethane
 coat and where they repaired a few boards after advertising their expertise at repair jobs used a board that was so dark it stands out as looking very odd!
Overall a mediocore result  and I would not recommend this company who apparently have much expertise and experience in this specific area!

We had them back to repair the patch but it now stand out – nothing can be done about the nail holes they missed filling as the 2 pack is now down

My advise –
If you decide on a Professional –
*Go and check out  their sanding job as soon as they are done
*Then go back and check that they have filled ALL the nail holes or holes that require filling BEFORE they put the 1st coat on and go in the daylight as its often hard to see under artificial lighting
*Go back after the 2nd coat in the daylight and check it with all the windows and doors open so you can clearly see the floor and don't pay until you are completely satified

The last thing I would say is that whilst out boards were in  pretty good condition, they were baltic pine and whilst the did polish up OK they are much much too soft and dent very easily and so we will have to use big rugs on the boards to give them some protection and also some warmth as we live down South