Electronics have good PS and careful in/output stages and preserve phase integrity, esp cdp & amps (hence, comments such as "fast", "excellent bass", "drive anything" etc). The bigger amps, such as Bombay's excellent rg4, go easily very low (Hz) and have a lot of current reserves, to retain stability at very low loads (1ohm) without special modding; hence, with some spkrs' voicing that gives small prominence to mid-bass/upper mid freq, you hear a euphonic "bloom" as in tubes. Kops possibly refers to this as "coloured" -- in my take it;s the spkrs FR that's "coloured".
Good harmonic structure to the sound, the phase characteristics are excellent -- it makes very music enjoyable. Their bigger deep classA amps are wide-bandwidth.
Overall, excellent sound (note: I listen to classical and acoustic music & blues).
To date amongst the nicest, more musically correct and enjoyable ss. Admittedly, they play lovely music.
BTW, I also like YBA a lot, Goldmund, Spectral, FM Acoustics, Plinius... (amps)
BUT there's no free lunch:
They are expensive, cumbersome (big) and invariably heavy. Most products come with a external heavy PS which means TWO boxes or more (bar the power amps, of course). Which in turn means that, say, yr "integrated" amp doesn't integrate half the PS, so y're left with two or more boxes again -- as in a pre/power combo... At elast you only have one power cord (usually; I have two, for one box)
Coloured: external colouring is nickel, dark gray or light gray. That's another "colour" point Kops may have been referring to. The shiny products look better if you shine them every now & then and Symhponic provides the stuff to shine them with -- but it;s a nuisance to shine them rather than listen to music.
Amazingly, the products are very sensitive to how you play with the chassis res freq: using points, cones, & the like, various supports, etc, change the tonal balance. Of course, you can easily just plonk them on their own feet and be done with it.
Most amps go hot and even hotter in summer.
Other than that they're well constructed and quite reliable. I used to (softly) kick my RG4 "on" (same amps Bombay has) and then kick them "off". Saved me bending over. In fact I rarely kicked them off, just left them on all the time.
Anything else you'd like to know?