Just strung up a set of the new D'Addario XS strings on my Kimble F5. My first impression is that these are excellent strings... feeling and sounding...
I used to have one from the first, very early 2009 batch which had double-binding and crazy flamed wood all over. Not sure what kind of spruce was on...
Most of the center seam problems that I have experienced/encountered have been on old Gibson mandolins with 2 pc. backs... including Loar-era F5s and...