The RP-5 was the best sounding between the others I owned- the RH-5 and the RP-7.
The RH-5 Headphone / Linestage was the best value with balanced connections and had the best dynamics and was exceedingly transparent and neutral.
The RP-7 was actually less dynamic sounding then the RH-5 (Rogue's latest model) and a little too smooth / burnished for my system.
The RP-5 was in between, sounding nearly a perfect balance between transparent neutral and overly smooth. The sound was open, transparent yet had a slight tubey burnish / polish that was easy on the ears and ultra refined.
That said I prefer the sound of my Cary SLP-05 which is my end game preamp.