I found its messing with history incredibly annoying. Here's why...
Every single letter typed creates a new history item. It got to the point where so many history items were added that HN was pushed out of my history: I couldn't use "back" to get back to HN. I had to type in the URL to get to HN, then I had to find the comments page to get back here again to see the discussion.
I continued on looking at other HN stories. Once, I went back too far and landed on the HNI page again. I typed "L" as one does in Vimperator and Pentadactyl to go forward and get back to HN. The only problem was the text box stole my input, this resulted in a new query and a new history item, erasing, once again, HN's history item. I had to (again) type the URL to get here!
Every single letter typed creates a new history item. It got to the point where so many history items were added that HN was pushed out of my history: I couldn't use "back" to get back to HN. I had to type in the URL to get to HN, then I had to find the comments page to get back here again to see the discussion.
I continued on looking at other HN stories. Once, I went back too far and landed on the HNI page again. I typed "L" as one does in Vimperator and Pentadactyl to go forward and get back to HN. The only problem was the text box stole my input, this resulted in a new query and a new history item, erasing, once again, HN's history item. I had to (again) type the URL to get here!