I use watches from this series for over 10 years. I started with similar Navihawk and was happy with it for a long while. Most appreciated features were world clock with easy zone switch, alarms, and waterproof (can use in the pool or when diving). Replacing batteries (have to send to Citizen) was a pain and also pull-out button was a point of failure - it used to fall off. This watch, while keeping what I need, fixed both problems. Eco-drive means no battery change and a new design of mode switch is more reliable and faster. Add atomic watch setup, lighted deal, and titanium body - and you get a perfect watch. The watch is sizeably larger old Navihawk, but this is not a problem, it still fits my wrist well and due to the use of titanium it is not heavy. My only small complaint is a bit smaller size of lettering. Digits on the main electronic display are a bit smaller than on the old one and letters on all indicators are very small - for good eyes. Most of them are still very visible - white on black. However, on the bottom there are three positions indicated in brownish red on black - and it is hard to read - I am always forgetting which is calendar and which is time.