We have darker wood floors in some part of our home and never again for us. EVERYTHING shows, even after just washing the floors. Also the fact that it is darker, it seems the rooms are smaller.

So if you are not a Mr.Net person, you may regret the choice. Worst case scenario, can you get the lighter brown you were looking for and just repaint at some point the walls to something else. It is much easier/faster than having to re-work on floors.