Last March I wrote about about a Sunday night stay at the Tampa REN where Daylight Saving Time had just occurred. I quickly verified that the time on the clock was correct but didn't have my glasses and didn't see that they messed up the am/pm thing. I was an hour late that day. When I mentioned it at checkout, they told me how another guest just praised them for resetting the clocks in some 500 rooms in a few hours.

I guess the speed doesn't account for accuracy.
I too like to do my own via the clock or cell phone. Problem with the clocks is that each one seems to be different and has way too many options - dual alarms, wake to CD, etc plus needing a magnifying glass to read and decipher the picture settings. One setting off and you are screwed !