Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Less than perfect

The pump efficiently moves water - which is good. It would be better if it hadn't started to leak so much of said water out of the top quite so fast (I only got it a few hours ago!). I guess I'll try to patch it up to stop the leaking (which I suspect is due to a very cheap and poorly fitting seal for the outflow pipe) but there must be better pumps out there without that inconvenience.