I heard the Krell and agree with the assessments above - not nearly as good as the price would require. I owned a Classe CAP 100 - good sound, comparable to the Krell for a lot less scratch. I have since bought the Pathos Twin Towers and am in heaven - clarity, smoothness, detail, extension. If you can live with the heat a Class A amp puts out (it runs really warm) and have 8 ohm speakers which can live with 30 watts, it is an amazing piece. There is a used one on Audiogon for $3500 (comparable to the Krell) and would definitely look into it.
