Played this list against an eldar list at the weekend and tabled him (though he was using a non-competitive saim hann style list)

Overall i think it performed pretty well...

overlord - warscythe, command barge

3 crypteks - all destruction, 1 pulse

triarch stalker

9 warriors with Ghost Ark
10 warriors

2 x annihilation barge

props to the command barge for taking out 2 warlocks on jetbikes in one pass
the ghost ark is a pretty amazing vehicle as well - those extra d3 warriors per turn really help
as he had no true tanks, the crypteks and the stalker were just used for softening up warlock jetbike units