Weeeell.... they are very worth it, except, of course, for when they aren't.
Mostly, the tier builds are just about giving you extra options for how to build your army, rather than giving you any sort of boost, and indeed most of them have more weaknesses because of their restrictions than strengths due to the bonuses. However, some tier lists are quite competitive, and very fun to play. I'm not sure how Elyliths list plays, but if it looks good to you, perhaps it's reasonably strong.
Still, I usually wouldn't recommend aiming for a tier list until you had enough models for a general mix-n-match army, especially if you're a newer player. The restrictions on what you can take, and often having to take multiples of units that won't work well with other casters can really limit you if your just starting to collect. That said, if you only have to swap out a couple of models to make your general list into a tier list, then I say go for it.
It's all in the name.
Looking for a club in Brisbane, Australia
? Come and enjoy a game and a beer at our friendly club in a pub, Sunday nights from 6:30. All brisbanites welcome, don't wait, check out our Club Page on Facebook
for details or to organize a game. We play all sorts of board and war games, so hit us up if you're interested.
Update:From the 25th of May 2014 we'll be Meeting at The Junction pub in Annerley, opposite Ace Comics and Games
Still playing 40k, Warmachine and board games of all sorts!
Last edited by maddermax; 05-31-11 at 01:41 AM.