I soloed SM-ARM with my ENH shammy at level 50.
It was pretty hard cos i gotta be careful with pulls and also learn when to run out of herod's whirlwind.

The axe was pretty rare alright...

after 7 runs, i got
-3 shoulders
- 1 leg
- 2 axes
before i finally got the damn helm.

so helm is very rare to me.... altho i think leg is rarer but perhaps i got lucky.