Whilst I've been playing since Rogue Trader, I never started Eldar till about 4th edition. I chose Ulthwé for a number of reasons... I liked the idea of them guarding the Eye of Terror and the use of webway portals for their old strike forces, plus their colour scheme appealed to me being fairly easy to pull off. I had my fair share of victories throughout 4th, 5th and 6th but I've only had a handful of games with them in 7th so I'll be interested how they fare in 8th.