If you are unhappy with the upgrade replacement then you should call EVGA and express your concern. They have 24/7 technical support via telephone:

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Moving to the Warranty section.

It's a FREE upgrade from 550W to 650W.  If your worried the 650w PSU will use more electricity, don't be.
 
 
 

EVGA, if my memory serves me right without reading the terms and conditions. Reserves the right to replace your product with equal or better performance in the case they do not have what you returned in stock.

So, I'm going to assume, they did not have what you sent them, so they gave you an upgrade.

If you are concerned with power draw, then like bcavnaugh said, your computer only uses what it needs, not the entire 550w. If EVGA gave me a 1200w to replace my 1000w they would get a huge thank you. I don't think anybody here understands your reasoning for wanting to exchange what is essentially a free upgrade.

Those are both the same platform, Superflower Leadex. The 550 G2 is only a better PSU when you compare ripple, which between the two the ripple is so low it doesn't even matter.
 
Source:
550 G2
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=440
650 G2
http://www.jonnyguru.com/...op=Story5&reid=429

RainStryke
Those are both the same platform, Superflower Leadex. The 550 G2 is only a better PSU when you compare ripple, which between the two the ripple is so low it doesn't even matter.
 
Source:
550 G2
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=440
650 G2
http://www.jonnyguru.com/...op=Story5&reid=429

Nothing here to moan about whatsoever

Techpowerup on the 650....
"There is the 550 G2 unit for 10 bucks less should you need a PSU for a single-VGA system you don't intend to upgrade with a second VGA in the future. However, given the low hold-up time of the 550 G2—at least with my sample—I would gladly pay the small price difference for an upgrade to the 650 G2."

This thread is pointless now imo!

Please delete this thread, thank you. 

Gnalan
Thank you all for your opinions. You all assumed a few things and you all (but for Zuhl3156) avoided answering my questions. The 650 G2 is an excellent PSU, I am not disputing that. Why I think the 550 G2 unit is superior is irrelevant. There are a myriad reasons and circumstances that one would prefer the 550 G2. Either you've not thought this through or you've decided that in your opinion you consider such reasons insignificant. I did not come here asking for your opinions about this decision. Naturally, your sarcasm and mockery was not appreciated either. 
 
I do understand basic electronics so anyone else who wishes to inform me that an increase in a PSU's wattage does not increase electricity consumption on the same system can save their time. To iterate, as it does seem necessary, I want an identical replacement. I think it is only polite to ask a customer first if they are willing to wait for a replacement to come into stock. If not then ask them if they would be happy with another model. Making the decision for the customer is what I am objecting to. A simple email would suffice. 
 
I am not in the US and I have contacted EVGA. My original post explained that I am waiting to hear from them. I had hoped for some insight here but I was mistaken. I'll deal with EVGA directly in the future. I'll consider this thread closed now, thank you. I hope everyone has a nice day. 

If you are in Europe let me know and I'll ask someone in the European office to contact you.

Please delete this thread, thank you. 

If you change your mind just let me know