I've reworked my item handling plans in light of the new Redpower sorting machines in pr4. I think it really shows the power of the pr4 tubes (would have taken like 5x as much BC piping to do this).
The main new feature is the "item bus." The only way into that section of tubing is via sorting machines, and the only way out is through colored tubes. That means basically that you only need one main tube to connect everything together. Instead of having one chest, and a dedicated pipe to send stuff to the macerators (and another for each additional set of machinery), you can just configure the sorting machine to tag the item with the macerator's color, and send it off. The product can even return over the same tube! Even better the stuff coming out of the machines can be sent to multiple destinations without having to build more dedicated piping.
The callouts on the sorting machines show what color it's using to tag what.