I have only had mine a short while but I have heard a ton about them. Their main downfall is they are a little louder than most pumps that do the same GPH. Besides that, they are extremelly reliable, very easy to open to clean/fix, and pump a ton of water!
Mine was actually seized when I bought it, because the previous owner let salt water sit inside of it for a long time so there was a lot of buildup on the propeller and impeller (and impeller housing). I used a screwdriver to remove all of the build up and it works great now!