I am a KJVO guy.... Sort of. It is the version I stick with, quote and believe.
BUT!
I'm not against all other versions. Some I am against, but not all. Sometimes I even look at other versions to see what they say, but in the end, I stay with what the KJV says. If I am in a debate with someone who uses something other than the KJV, I do acknowledge their version (but I will also let em know what the KJV says). 9 times out of 10, it isn't a problem.
Why do I like the KJV? Well, first off, it is the version my Pastor uses. Second, I am more familiar with it and comfortable with it. But what impresses me the most about the KJV is the history of it and how it came to be. Not one man with a single bias or even a few men. But dozens of scholars who really didn't like each other commissioned by a king who wasn't going to look well on failure to deliver a Bible that was accurate.
Now, let me tell you what I don't accept: The practice of switching Bibles based on what a verse says. In other words, if you are reading the KJV and come across a verse you don't agree with, do you find another version to believe about that one verse? If so, you might as well write your own Bible, because you are trying to make the Bible line up with your own beliefs; not the other way around. Now if I don't like what the KJV says, too bad! I change MY beliefs based on that!
So, if you are an ASV type of guy or girl... Stand by it! No ill feelings from me. Just don't switch Bible versions when you can't prove your point by the one you read.
So yes, I'm KJVO, but not in the sense that I look down on other versions.