Weaknesses: The battery life of the original 405CX was terible. After 2.5 hours left with very little life (and me). Sent for repair after 4 months and hay Garmin replaced it with a new one. The only problem now is it shows 'Her' watch battery isn't as great as we thought.
Overall: Besides the battery life on the original 405CX it's a great bit of kit. Seach on the web for some good deals - up to 1/3 off rrp is easily found.
Strengths: The 405CX is a great watch but the batery life is not that great. Always very good/quick at picking up the GPS signels. Holds the signel in built up and tree lined areas.
Weaknesses: The battery life on the CX is not as good as Garmin state, resently used for trecking and couldn't get above 6h 25m life out out it with the vertual partner and heat rate monitor link switched off and charged until we used it! The battery isn't replaceable so when it's life is up (500 ish charges for Lithiam) you have to buy another watch!!
Overall: As long you you don't need it for more than 6 hours use - It's a great watch. The reports on the Garmin web link take it to another level.