I was a longtime BlackBerry user, lived on my Curve and Bold and couldn't imagine typing on anything else. Switching to the One about four months ago now I was pleasantly surprised by how good the stock keyboard was, and how easy I found typing on it. I've continued to find that it's very good - it's not the same as using a BB - I find that I have to take more care and look at what I'm typing more, but the auto correct and auto suggestions are really solid, and I'm comparably fast. In some ways it's not as easy to type - I don't think the BB physical keyboard can be equalled to be honest - but it's actually less testing on the joints than physical typing can be when you type for a solid length of time.
To offer an unsolicited opinion in addition - the one thing you don't realise until you actually make the switch is that the messaging services on the One are just as good (and in some respects better) as on BB, which was an absolute shock to me.
I still keep my 9900 for international travel (you can't beat BIS), and I am still a BB romantic, but believe me, you will be amazed by the One - it's an incredible device to behold, and to use.
Good luck and enjoy!
Sent from my HTC One using AC Forums mobile app