I'm one of the guys that kept my RF PBR300X4 using it with a custom made wiring kit from V Twin Audio to connect the rear to the amp so you can utilize your fade control.
At 75 watts per channel the efficiency of this amp to the Vic 6X9 component speakers in the rear and the JL Audio's 6.5 in the front is excellent. My sound stage is actually pretty even although I tend to fade a little to the rear at times. To answer your question.
Anyone thinking of doing Vic lids would be impressed with the outcome even using the factory 6X9 offerings. 50 watts is just a safe amount of power to these speakers. 75 seems to be the ticket. Impressed so far at how hard these speakers hit. Nothing but compliments from anyone that hears them. Blows away the sound system upgrade from HD which is available in their CVO models as well.
2011 Cross Country. D&D's wrapped - VM1DR cams - PC5 - LLoyds high performance filter and ATS (Adjustable Timing system). Power output 115HP/115FTLBS tuned by KMC. Klock Werks flip shield - RF/PBR300x4 amp - Hertz HCX 6.5's - Victory 6X9 Magnum Lids - Victory XM - HMD Black Pull Backs with Victory performance grips. PIAA Led3 driving lights. accessories from Arlen ness - Witch Doctors - Noemtz Designs - Kuryakyn. Blacked out treatment powder Coat by PPC Stuart fl.