I've worked with three of those, and the end result starts like the pics and ends significantly darker in my experience. Something to do with South American wood I guess. Both beginning and end, it's a beautiful wood, you'll like it.
Although I didn't want really dark wood, my husband didn't want oak, and the others were too red for my tastes. I still plan on having a couple of area rugs in the living room of a light color, so if the wood ends up too dark (for my tastes) the area rugs should lighten things up.