I have had my Emperor 400 for well over 20 years without a problem. Recently it wouldn't power on after a cleaning. I left it plugged in and it eventually came on and started working. 2 days later, I noticed it had shut off. It did come back on and has been running smoothly for the last few days. But, since I was soon to leave on vacation, I didn't want to chance this happening again while I was away so I purchased the new 400 Emperor from Chewy and it arrived promptly in 2 days. I'll keep the new one and give away the old one, which like I said, seems to be still functioning. Bottom line is this filter is a real work horse !
Emperor 400 is one of the best choices for a 100 gallon aquarium. I'm enjoying the filter system. Also Thank you for your quick delivery. ( FEDEX)