They are excellent. I just played a large event a few weeks ago, placed in upper 20% and they were excellent in my all TZ/Khorne list. I took 3 units of 3. Here's what they did:
Game 1: chased after warmachines, up against TK Arkhan+ light council. they got a skullapult and a casket. Then started getting into rear of other combats.
Game 2: I took a hard loss, started drinking to wipe memory of that game out before it set in.
Game 3: lizardmen. I got them into a skinks, and those flame template warmachines dudes, and won, one unit got into a steg and did 4 wounds to it. before dying.
Game 4 vs nurgle doc. They have hatred vs nurgle, and with the +1 to hit spell from metal. they excellet and eating his furies, his lone beasts and doing 3 wounds on Epididumus which made him play keep away.
Game 5: skaven. I put them face up into a horde of giant rats, and won. Put them into blocks of slaves, killing the warlock and won. Granted I needed treason to get the break test failures. Then they started hitting the rears.
Other notes, slashing attacks typically end up being 5-6 wounds per game, nothing to write home to mom about, but I'll take it. I tend to keep one unit within 12" of my loc for lore attribute chances. I think in the 5 games I only spawned 3 more screamers.
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