I love my Corda, it's just a great sounding amp. It is a very noticable improvement over both my Total Airhead and the headphone jack on my Denon 370 (which was so loud as to require the use of a RS headphone attenuator). The bass is very deep and powerful, but also very controlled. The sound just seems to blend smoothly from top to bottom without any harshness or blurryness to it at all, just well balanced sound all the way. It's also VERY quiet, quieter than my Total Airhead, and far quieter than the original Creek OBH-11SE I used to have.
Speaking of balance, other than the volume pot which as we all know tend to be hit and miss when it comes to tracking accuracy even in the most expensive non-stepper varities, it's VERY well balanced due to the tight tolerences in all the components used.
I don't use the crossfeed often, but it also works quite well, without the sometimes annoying warming effect of Headroom's crossfeed. The only disadvantage to the crossfeed is that it can reduce the perceived bass in some music that has bass mostly in one channel, and when the bass is in both channels, but out of phase.
Mine was the DYI kit version, and other than having a tad bit of trouble getting the AC plug/switch into the backplate (more than a tight fit, the plug/switch assembly is larger than the hole it fits into
), it was quite easy to assemble, even though it was the first time I had ever put together any kind of electronic DYI kit. I had no trouble with the soldering using regular RS 60/40 .032 solder and the 40/20 watt iron.