First impressions: It's a nice watch with a clear look. I was a little worried about the lack of backlighting, but was pleasantly suprised that I was able to see the luminescent dials clearly at any hour of the night.
Pros: Quick atomic time synchronization (usually within one to two minutes after the initial synchronization). Simple to use.
Cons: Case is described as stainless steel, but back piece is plastic. Originally listed by Amazon as a solar-powered watch, but instead powered by regular battery. Battery life expectancy about 2 years, though it may lost longer by disabling the auto-sync feature.
Overall comments: This is my first atomic time wrist-watch. It automatically synchronizes with atomic time once at midnight (a function you can disable if desired) or on-demand with the press of a button or two. It does this by scanning for a radio signal. According to the instructions, you're supposed to leave this watch near a window with the 6-o'clock side facing the window for best radio-signal reception. Reception can of course vary depending on your location, but the watch has successfully updated several times even while I was wearing it.
I like watches with flat crystal surfaces, because it allows me to paste a PDA screen-proctector (cut to size, of course) on them, which keeps the crystal from scratching. The crystal on this watch is only slightly curved, and in only one direction, meaning a screen protector sticks nicely and evenly to it.
The watch is waterproof to 50 meters, which (in Casio terms) means you can go swimming with it, but you should not press any buttons underwater. I try to keep my watches away from water when I can, but it's always good to know that it should survive most water-related mishaps.