Gain an Extra 4 Skill for any Ward. Regen would be useful as an idle/perpetuation set depending on the potency. BP Damage could turn out to be more damage than TP bonus. But, over all, a player would be losing the Set Bonus for those rare Blood Boon procs.
According to Tachi from BG, these have 5% Blood Pact damage, making them the best physical pact legs and situationally better than Caller's +2 when the TP bonus becomes ineffective (depends on pact/merit level). Also the best skill legs.