It took me about 2 weeks until I was up to normal speed. It was probably a month before I could use it with zero difficulty. I used ktouchtype to train on it.

It took me about 2 weeks until I was up to normal speed. It was probably a month before I could use it with zero difficulty. I used ktouchtype to train on it. The thing is if you have any idiosyncrasies in your touch typing, the Kinesis will not forgive them. The way that the keys are stepped down into different levels makes it difficult to use the "wrong" finger to reach the desired key. Of course, ultimately, that's for the better. It will just take you a little bit of time to unlearn some of the not-quite-official typing habits you may've developed over the years. I absolutely believe it's worth the effort. Wrist pain is almost never an issue for me anymore. The Kinesis is highly durable and cleans up very well. I used the "Natural" keyboard for years before I switched to the Kinesis. There's no comparison. I had to replace the MS keyboard twice a year or more. Been on the same Kinesis for about 4 years and there are no signs of it wearing out. The only downside is that sometimes there are weird firmware issues that sit unreconciled. For example, there is some incompatibility with the Intel USB 3.0 bus, Windows 7 (at the time, Win8 was the latest OS, and it didn't affect Win8; don't know if it affects Win10 or not), and the Kinesis. It simply isn't detected under that OS. No problems on other versions of Windows, other OSes, or other USB busses. This meant I couldn't use it on a Bootcamp'd MacBook Pro. Kinesis was apparently unable to get Intel to cooperate in debugging the issue with their chipset drivers. That said, it's an investment that I enthusiastically endorse if you're willing to commit to a couple weeks of learning curve (and since we're talking about the health of the hands needed to continue our careers here, you definitely should be).