For those in Italy like me: I've got this natural PLA filament LINK and I was amazed about the quality of the prints. I don't know if that's because the natural PLA is better than coloured filaments but the prints are so good! The flat parts of the objects are very flat at touch and layers are visible but unnoticeable at touch, at least with objects I've print.
Here a picture of a plug I've print to test the precision of dimension because I've got a hole to fill and that was a test of insertion. It was perfect.
WP_20151229_008 1.jpg