The newer D 55 and D 50 (Tacoma and New Hartford built) are very different guitars and should not be confused as essentially the same. The D 55 has a AAA sitka top. The D 50 has an Adirondack spruce top and red spruce bracing. This is alone makes a big difference in sound. Whereas the D 55, which is Guild's flagship, is said to be more balanced across the sound spectrum, the D 50 is said to be louder and project better. Since I only have the D 50, I can't say if it's any more or less balanced but I will say that balance is not a problem for me, at least, and the guitar really puts out the sound and is suitably rich sounding. I will say this: Collings charges $ 1,000 more if you want a red spruce top as opposed to sitka. And Martin's high end versions of such classic models as the D-18 and the D-28 have red spruce tops, whereas their standards are sitka. Not that one is better than the other, just different. I did have a brand new D -18 for a short time, a new one, and I will attest that it did not have volume and projection I wanted. Martin's highest end standard models such as the D 41, 42 and 45 have sitka tops. More touring/performing musicians, however, play the D 18 and D 28 versions and more often than not (at least in the modern era) with Adirondack/red spruce tops.