Been playing around with my Eldar lately and the only weakness at first with 6th I had was longer ranged anti tank. With hull points it was taking too long to kill vehicles. Instead of keeping my fire prisms. I dropped them. In their place I added in warp spiders and swooping hawks. In conjunction with the autarch you're all but guaranteed to have both units come in the second turn. With only needing 3 glances on most vehicles, these two units working in conjunction seem to work very well at glancing vehicles to death.
Yes, you don't get your haywire grenades the first turn but anything except land raiders can be dropped by the warp spiders if you're hitting side/rear armor. By second turn you'll be hitting these most of the times anyways.
Anyone else have successs with using these two units in conjunction?