Reliable, easy to read day or night. After 4-years of abusing my Casio MTG900 on/under water, clearing land, etc. on the east coast of FL, plus timing food on my grill, here is what I think a prospective buyer should know. (1) When EST & DST change, I leave my Casio out in our screenroom to make sure the WWV time signal from CO activates a change; aways works. Small time updates are received regularly while I'm wearing it outside. (2) Be sure to carefully save the instruction booklet; you'll want to utilize other functions sometime. (3) Most important, when you initially remove excess band links & pins, carefully preserve them with your booklet. Nobody sells those spring-pins and it is just a matter of time before you will catch the band on something, bend a link pin, and urgently need one of your saved pins and/or links. Easy to fix using a tiny eye-glass screwdriver to retract the pin's spring, and a magnifier to spot the etched pin orientation arrow.