I've installed the nxV200 R2 amplifier modules and I have to admit that they sound very well! First thing one notices is that the modules will happily deliver a lot of tight and clean bass. Next thing, is the wide bandwidth. Using a descent source, all the detail will be easily noticeable. Mids are realistic especially if one plays some jazz music, and high frequencies can be really sweet and clear. However, as many others have already mentioned one can easily tell a good quality from a not so good quality recording. Overall, I am very pleased with the modules.
Here goes a pic of my amplifier finished. The amplifier is built in dual mono configuration with a 2*28V, 300VA toroidal transformer, two 35A/200V rectifier bridges, four 6800uF/63V/105C filtering capacitors per channel and 100nF/630V mkp bypass capacitors. I used 4.7uF/450V mundorf coupling capacitors in the input stage although my source has no dc offset. At the rear I installed a simple delay relay for the speaker connection in order to avoid any annoying noise from the power switch and/or the charging of the filtering capacitors.