I haven't had any problems with water getting inside..
After reading the reviews, I bought it and then bought the improved O-ring. But, I ended up with one that wasn't a good fit so, I went back to the original.  Even with the original, I'm not getting any water inside of the battery compartment.<br /><br />I've now had this for several years and it's working just fine. It does go thru batteries but I've been using rechargeable batteries. I like this system rather than one that's plugged in all the time because I don't have to be concerned with vampire power loss and I can bring it with me when traveling.
Rating: 4 stars