I had pulz - twice ( Once it was with balance Inputs)
No way it is "flat" it has a goo "punch" which makes it feel Powerful.
Sepration is good as RS 250 is Dual Mono construction - almost like having 2 seprate amps.
also newer versions have gain control - lot of people use it directly with single source .. although I an told it is not "safe" is it true.
Far far better choice than Norge ,pulz is in different leaugue - also if you are using RS 100 Preamp it has good phonostage..
In used market sometimes you get it at very good price , as indian items depriciate more ,and should be grabbed if you like the sound