Strengths: Robust, clear display, multi sport usage, waterproof, idiot proof, lower in price
Weaknesses: slightly larger than others on market
Overall: I bought this primarily to wear when out on my mountain bike either round my wrist or strapped to the cross bar. I fell off numerous times going down hills and mountains and its still going. It has also had its fair use in the rain (...and puddles).
Recently started training for the BUPA Great South Run 2012 and continue to wear it to track my progress as I love uploading the data to the Garmin Software it comes with and onto the Garmin Connect website.
Yes its bigger than other watches on the market but you completely forget about its size when your running and in the zone.
It came with a heart monitor as standard and feels extremely comfortable to wear.
I would recommend this device to anyone and everyone as it can be used across multiple sports (by strapping it on via the watch strap or by purchasing a bike adapter) and is at a very good price.