Back in my younger days I once was tripping nice and hard at home with some friends. Just as a laugh I decide to rack a gram of K into one long spiral shaped line. It's a pretty hard thing to do when you have no real grasp of time. But then I foolishly went to snort a little bump off the end. So a snort away, lose myself a little, then come back to reality and look down to see that I had almost snorted a whole point.
Then for the next 2 hours I was stuck on the couch thinking, "Breathing, yep I'm still breath... ok how about now? Yep still breathing. Breathing is good."
Thank christ K wears off very quickly, and once it wore off I was a bit, "Woah that was a little bit too intense.... Let's do it again!" Yep that's right I'm a sucker for punishment.
So in summary, if you like to turn your brain to absolute mush till you get to a stage where your struggling to hang on. Then go for it since one of the good things about K over most other drugs, is that it's a relatively short half life and when it does wear off it wears off pretty quick.
But if you sometimes get a bit over whelmed by world turning upside down on itself then it's best not for you.