I like it in a selfbow, but I think you are referring to a laminated bow? If so, my limited experience tells me to stay away from it.
'Course it will depend on the bow design, but two of the main things that affect performance are limb weight and recovery. Osage isn't tops with either one, but if the design relies primarily on the glass to do the work (like most recurves) you probably won't see much difference.
In a narrow limbed, deep-cored longbow, it will make a difference. I've only had once chance to shoot two longbows side-by-side that were the same model from the same bowyer, one with yew limbs and the other with osage limbs. In that particular comparison, the yew drew noticeably smoother, was noticeably faster, and had WAY less hand shock.
Talk to the bowyer--he should be able to tell you what will work best in his design. If possible, shoot a couple side-by-side and see what you think. Personally, in a laminated longbow yew is my first choice. Until I find something that works as well or better (haven't yet), it will be my only choice.
Chad