i dont have either of those units but i do have
a Marantz amp and receiver, and the construction on both are wonderful, so i would imagine, that the units that you are looking at will have very good build quality as well...
the amp and receiver i have, are of Very high quality.. i have an mm9000 amp, and a sr6300 receiver.. having owned these 2 pieces i would be willing to purchase more Marantz components... hope this helps, i know its not on the specific units you were asking about, but you havent gotten a reply yet, so i figured i could at least let you know that the build quality of their products is very high...
