Guild Wars 2

This thing really has me scratching my head. It should allow for a competitively viable DPS sustain, but the builds I come up with almost invariably perform better using berserker stats (mainly because cleanses are so unreliable that you need to overwhelm condi classes instead).

The one exception is of course warrior, who run sigils of battle along with both generosity/purity to full effect AND has cleansing ire and a full cleanse signet… Yet still can be overwhelmed in team fights.

Has anybody had success using this stat combo?

I think Knight is too niche for the current meta to be viable.
Bunker classes either use Healing Power amulets (Shaman/Cleric), Celestial or Soldier.
Knight gives (too much) Toughness but 0 Vitality/Healing Power, meaning that condi classes would wreck you. Also, the Precision stat is kinda wasted, mostly because of the recently buffed Sigil of Intelligence, which helped low precision classes to deal a lot more damage.
It might work in other environments (maybe scheduled 2v2 or 3v3?), but I for the current sPvP game modes, it is simply outshined by everything else.