I just got a Sun Eater yesterday, and i've been very disapointed.
I've been extremely lucky to obtain Ironfoe when i was 61 or 62. I had a stormcaller as my healer weapon and i've been using it when pulling with the avenger's shield, for the bit of added damages at the start, but thru all of my testings, Ironfoe let me build aggro "on average" just as well as the Stormcaller, only it very often have large "bursts", proccing off several reckoning's double attacks (and leaving me under the impression i'm in fact a windfury shaman).
I hoped tho the Sun Eater would be an upgrade to Ironfoe, but on short testing, it seem to be just barely generating the same threat, making it better to use than the spelldamage blade when i'm low mana, but overall less good still than my little hammer.
It might have something to do with the way i geared myself and with my talent setup tho, but by quick deduction, i'd say the Sun Eater is a very situational blade and not a real upgrade over a spell-power weapon.
As a side note tho, it seem Everyone just can't miss that you're a -Tank- type when you're carrying this blade at your side. Warriors raise an eyebrow, other paladins look at you wierd and people asks you more politely if you'd be willing to heal.

_________________
"
Anatheme c'est la reroll de Benediction."
- Yshuta
My armory