Phase perfects do NOT have little value. They have excellent value and if you don't want to give yours away then don't, I certainly do not intend to.
What a Phase Perfect offers is essentially the ability to have 4x the rated HP of the unit provided it is for the right machine. Other types of power, specifically power from the utility supplier, monitors peak current requirements. If you pay for three phase power you will be charged a for the peak draw you have for a certain amount of time after the peak, at least here. It doesn't matter if you only reached that peak for less than 1 second. You pay for what you have been shown to be able to draw. Non VFD supplied motors (Coolant pumps) and transformers are really bad for inrush.
A phase perfect acts as a very good peak suppressor. Most CNC equipment, especially milling machines, do not use near what their rated power requirements are on the cabinet. They will use these values under very specific conditions such as if you start a bunch of coolant motors at the same time, rapid to a spot while accelerating the spindle to max RPM... all at once. Because of this the Phase perfect is the most optimal match to CNC mills, even if you do have utility three phase.
I have a mill that is rated to consume more than double what I have for current coming in from the main panel. I have run this machine hard and my utility company said they monitor my draw even though they don't charge for peaks for my service. They found my peak was 1/4 what the machine nameplate calls for current draw. I am very confident that if the Phase Perfect wasn't soaking up the inrush and acceleration currents I would be right near the rated draw.
This, as well as overall efficiency, makes the PP far superior to RPC, even if it is a "Blue" one.
If no one wants to buy mine I'm totally comfortable running with the idea that having a spare is good insurance too, as said earlier if you have it fail it could be bad for making delivery deadlines!
I think swapping out caps in older equipment is a great investment of time and money. I've had a separate discussion on this and there are varied opinions. One thing is certain, it only makes sense if you do it before you need to. Likely if you do your equipment has had an electrical lease on life, at least until a monitor dies. Replace that and THEN you have given most of your electrical a big boost in reliability. I'm going through a couple DMG machines now and we'll see if this proves true with them.
If anyone does want to follow a massive DMG machine rebuild which does touch on this, check out:
http://www.practicalmachinist.com/v...st-insane-member-they-will-maho-owner-321712/