Looking at the one picture CHC has of their 'Supercap', it really does look put together with a very high standard of build. One thing that struck me it that the common earth that ties into each of the seven voltage regulator boards is a big chunky metal bar instead of the (?22ga) skinny wire that is found even in the 552PS. If similar attention to detail is to be found elsewhere, I would imagine this could be quite a formidable power supply. And the price certainly is very competitive. The case is a little generic and unbling, but most of the money looks like it went on the insides-which is a good thing.
I also approve of the option to use Mundorf filter caps...not only do these have lower ESR than the standard BHC/Aerovox, but probably have greater longevity-and the extra cost of using them would be offset by improved sound and a greater time interval between servicing/recapping.