I purchased this Citizen watch a few months ago and have been amazed with the split second accuracy.  It is my first Citizen, first Echo Drive, first Perpetual and first atomic timekeeping watch.  I own way too many watches of various brand, but I really love this Citizen watch above the others.

I like it enough that about two weeks ago I ordered the CB0020-50E.  The AT4007-54E is all black with sort of a gun metal finish and the CB0020-50E is a completely different look.  Having both now, I might start giving some of my other watches to family... because I'm really spoiled by these.

I highly recommend ANY of the Citizen Eco-Drive atomic perpetual watches.  Great craftsmanship, great technology and a five year warranty.  This one is several months old now and I've never had to set it.  Still perfect time easily to one tenth second.

It might take you a day or two to find the best place in your house to position it at night... to ensure you receive the radio signal that sets the time at 2 AM.  Don't be surprised if the "manual" radio sync fails.  I get too much interference during the day, but it works flawlessly for me in the 2 AM auto mode.