The 0/-6 structure tool is a relatively new one - we don't have an image for it (we're out of stock while this is being written so we can't just shoot one yet), and neither does Red Creek Sweden. But it has quickly made a place for itself among the regulars - particularly in newer snow in the mild sub-freezing range. It's always worth testing this against the 0/-10 in moderate cold temps.
Red Creek hand structure tools are highly functional and easy to use. You need to push on them pretty hard to make a good impression, but the good news is that it's almost impossible to ruin a ski by pushing too hard! These tools have the reputation among the European pro marathon teams of providing good benefit for the duration of a long race, while more aggressive tractor-box tools have been connected with slowing skis due to pollution. We have been utilizing these simple rolling structure more and more over time, and have been very pleased with their performance.
