Any opinions on PS Audio Power Plants

PS Audio UPC200 is a big winner with my gear.
Larry

I use two UPC 200 on my amps connected into dedicated lines, sources connected to a Power Director 3.5 that is connected to a Power Plant P-500 that's connected to it's own dedicated line and the results are fantastic. In regards to the fan noise in the p-500 it's only heard about 2-3 feet from the unit and it's a non issue for me as my listening position is about 12 feet away from the p-500.

I'm wondering for an improvement in sound quality is it worth purchasing a PS Audio P500 Power Plant when I already have two Ultimate Outlet's? The UO's work very well though they definitely work best when you don't mix digital and analog into the same UO and when there's nothing but the amplifier plugged into the other UO? Thanks