The aqueon pro heaters are all aluminum, no glass to break. I just bought one for my 72g project, it was only a few bucks more that the standard glass ones. My experience with returns for online purchases has been pretty good for the most part. I find that if you call you can usually manage to have the return shipping waived.
At this time I do have glass heaters with a high temp mesh around it to keep it from smashing I will try a couple of these heaters I need something strong it's almost like they are proud of themselves when they can break or mess something up. Another popular game is they stuff there face with food then swim over to the filter intake and spit the food into the filter