I've putted Iron Counterweight on that, and i have some plate leg and glove with just +hit gems and +haste enchanst.
The procrate is not on PPM, is about 10-15% per swing. Seal of the Crusader actually helps its proc. I don't know if SoB or SoC make it proc as well.
Pre TBC this could even be used as DPS weapon for some time, actually its only good as offtank weapon. It increases raid DPS much more than your dps loss, and however you can put out some interesting damage with SoR since it's not affected by weapon damage but only by weapon speed, and the Nightfall is quite slow.
I once off-tanked Void Reaver using that and got aggro at about 50% of the fight, and i always tank Hydross' adds using the Nightfall as well.
And no, the proc doesn't suck, it's beautiful since unlike most of lvl 60 items, it had not get nerfed and still provide that 15% spelldamage. I once had some consecrations ticking for 300+ due to a triple (!) nightfall debuff on Karathress (was me and the other 2 warriors spamming hamstring

)
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