I've done the Powell Raise as part of a different Diesel Crew shoulder warm-up routine. The way one hand supports while the other hand raises the dumbbell makes it a great move. But after awhile it get less cool, then I just rotate on to something else.
Band Pull Apart
All kinds of inverted rows/facepulls holding onto gymnastic rings/TRX/blast straps
High Rep Low Weight Rear Delt Riases
Seated Upper Back GM's with a Yoke/Cambered Bar
1 Arm Dumbbell Snatches
Push Up Plus/T-Spine Extensions
In my opinion these sorts of moves should always be in the routine, almost every workout. Pick a couple, and do a few high reps sets as part of warmups, before the big stuff. When they start to feel less effective move on to the next group and do those for 2-3 weeks, then try something else.