I've used it in recurves and d/r longbows backed with bamboo, in bamboo backed yew tri-lams, and tri-lams with yew in the center and osage on the belly, etc. I really like it. I wish it was easier to find. Bamboo backed yew bows are something special.
Things to look for? Like any wood, I look for good grain/ring structure, as clear as possible, straight, etc.
The only thing I've found different with yew is, it's easier to over-dry it... and when it's too dry, the very best piece of yew will explode before it gives to the string.