How Schluter Edging is cut is so key to a nice looking tile job. We try to use this profile as little as possible and when we do we ensure the cut pieces are perfect.
Two simple things to remember.
Use a Non-ferreous saw blade and little chop saw
Schluter profiles have a slight back bend or angle to them. If you place this vertical face against the chop saw it will cut slightly off. Keeping the bottom tight to the saw is key.
Also using scrap wood to hold the profile still works well. The saw blade wants to twist the profile.
When possible we cut through the face and back for mitres. With a block of wood holding the Schluter piece still we get sharp clean cuts.
Later this week I'll post a video of the process