I recently took and passed Cisco 642-813 SWITCH exam. All those things you might have read about crashing simulators, poorly worded or bad grammar questions are true. In my case sim crashed 3 times when I entered same command, so I simply skipped the command just to continue with the exam. It made task incomplete and cost me few precious points. And do not even try Cisco's practice tests - there are too many incorrect answers to take these tests seriously.
All this is not to say that test is impossible to pass, but if you are not in a rush, I'd recommend to wait a few months before taking it. Hopefully, Cisco will clean up its act.
