I've got the 405CX and its great except the battery life is sometimes only 7.5hrs when its recording a run...got to admit that I never thought I'd see the day when that was a problem but I've come to enjoy my long runs and really like a record of them. Re watch strap, I didn't like the plastic one as I have quite small wrists so I changed it to the fabric one which was included when I bought it and that is really comfy.

Sometimes my watch has glitches where it gets stuck on one screen but I've learnt how to do a force reset (hold down the two buttons on right for ten seconds) and that sorts it out.