I read about people going into carb coma's and not liking carb ups. Honestly, I get a ton of energy from refeeds. I ate 1000 cals, 60% carbs before my WO yesterday, and I couldn't be stopped. I had unlimited energy, and felt great.
That being said, I almost feel like I should do longer periods of time without a refeed, but then do a 24-36 hour refeed, instead of 12. Like 10 days low carb, 36 hour refeed.