Actually I would recommend that everyone try a different outlet. I've tried a few of the more affordable. You can hear improvements in a $40 to $200 outlet, So I don't call them snake oil....I also have power conditioning on my preamp and Dac, made a nice improvement. For me, My amps have sounded best plugged directly into the outlet. I have also modified gear and have had terrific changes... If you are going to keep this amp for several years, that isn't a bad option IF you are convinced that this will give you the improvement that you seek.... My experience is that when you go to sell a piece of modded equipment, others just aren't willing to pay for the mods and you end up losing that money.
If he buys a Pass or Coda.... or whatever on a decent used price, dwolek won't risk losing much money, you can normally resell for about what you pay and the resale of the McCormack will help recoup a lot of what he pays for the purchase of the new amp.
I hope this all makes sense. Tim