I bought this watch having used a 205 previously. What a great piece of equipment! It's fairly tricky to start using at first, and the bezel can seem a bit tempremental, but once you get the hang of it there is no problem. The on-line features through the Garmin website are a great training aid. The amount of training gimmicks on the 405 is breathtaking, and for the serious runner there is very little to complain about. The only complaint I have about this watch is the price. I managed to get mine for £175.00, but there are places out there selling it between £179 and £230.