After seeing a lot of the gorgeous stuff Dr. Mike Skramstad and others have posted using more translucent e.max, I was encouraged to try some cases with Impulse (still no HT anteriors from me). So far, I really like it as it has some edge translucency built in and allows for some warmth of the dentin shade underneath to show through.
You can learn more about creating beautiful anterior crowns here: https://www.cerecdoctors.com/campus-learning/hands-on-workshops/id/3