My Garmin strap fell apart in Paris, so I went on Amazon and purchased a velcro replacement. I had the watch for about 1.5 years before the original plastic band ripped, which seemed to be the amount of time other straps lasted when I read reviews on-line.
The strap is inexpensive, and a lot more user-friendly than the original plastic. Also, you can tighten the velcro easily and adjust the fit better. The only downside is that the fabric must be cleaned regularly since it can get sweaty after a long run.
So if your Garmin breaks, don't fret! You can go velcro or just buy an identical replacement online.