I have a lot of experience with the the Raw Hammer series of equipment. If you like the Raw Hammer Pain and have a chance to buy one, then do it!
The Anger is NOT the same as the Pain! The Anger is a tad stronger in the mid-lane and backend! Not too mention the reaction shape on the backend of these two balls are different. The PAIN has a smoother backend reaction compared to the ANGER. The Anger is also smooth but a lot stronger and will flip pretty hard on dry backends. Of course lane conditions, layouts, bowlers style all come into play!
If you can't find a PAIN but want a similar reaction you could always buy a DOOM and take the polish off and bring the cover down to 1000 grit or lower. This will give you a similar reaction to the PAIN. Not exactly the same but similar.
Edited on 2/13/2008 11:51 AM