Reason I ask is, we're on our third (fourth if you count the one that was here when we bought the house) in ~12 years now; just had to replace it last night. Probably not a coincidence that pretty much all of them have a 3 year warranty.
I think we narrowly dodged a bullet this time. Two days before the main pump failed, the backup pump alarm went off indicating a problem with the battery. Opened it up, and the water level in the battery was so low that it was well below the tops of the battery plates -- I could not see any liquid at all. WTF -- it is supposed to have an "add water" alarm that goes off before the level gets anywhere near that low. If the two failures had coincided, we could've easily ended up with a flooded basement.