Anyone here with Experience on Leben's separates ?

hi guys

anyone here with experience on Leben's separates RS28cx and CS660p ?
is this a huge improvement over the CS600 integrated amps ?
is the pre-amp compatible with other power amps, solid state or tubes ??

Tks in advance.

not yet, i'd love to have the chance to do so. try shooting jeff day a question on 6moons about it. he's in the know on leben...
I am happy owner of Leben CS660 amp since 1 year, I have replaced the stock Shuguang KT66s with Gold Lion reissues
and I use solid state preamplifier (Accostic Arts) instead of Leben pre and driving Coincident Total Eclipse speakers.
I am happy with this setup.