I have been riding with the Vis 180 most days while commuting since December 2010. It has been incredibly reliable for me in rain and snow. Often times I haven't had fenders on the bike to keep the road spray and mud away and still no issues. The seal for the USB plug port is really well done, much better than anything on a Garmin computer or other supposedly waterproof electronics. I'll bet I can get another 3 years at least out of this, maybe many more. You might actually consider getting the smaller light and motion tail light, since I think this one is sometimes too bright, especially when you have other cycllist's around.