I've had this pump a couple weeks now. Easy to operate, comes with user manual. I did quite a bit of online research before choosing this pump and was concerned about several negative reviews concerning o-ring failure and the pump literally breaking after become very hard to pump. However after owning and using this pump, the only thing I can attribute the negative reviews to is either failure to clean this pump properly which would cause the filter to clog over time, and yes I can see if you tried to force water thru a clogged filter how it would break; and regarding O-ring failure, I just pay attention during reassembly and check to make sure the O-ring isn't leaking when pumping. Thats my take on this little pump. I also read how the ceramic element was very fragile and would break easily. So far I haven't experienced anything to justify this claim. The only time I handle it is when cleaning or boiling it. While I believe that being made of ceramic if you dropped it it might very break, the simple solution for me though is not to drop it. lol... All in all I think it's great little filter.