First, let me say the only thing that I know that is perfect is Jesus Christ; but as far as pumps, I have had NO problems with my Jecods (used to be JEBAO). I had been using Danner and Magpumps, but here in Texas, I noticed that all the watts I was using caused my tank to heat up more than I desired. I also had a large number of rigs to control the flow rate from initially ball valves, to a pretty sophisticated I thought, gate valve configuration. I first started out with a DCT4000 in a 100 gallon tank and upgraded my tank and my pump after 3 years to a DCS7000 in a 150 gallon tank. I could not believe how much quieter these pumps were. I was also relieved to not have to expend watts to run a pump and additional plumbing to restrain the output. The idea of an adjustable pump now seems to be a common-sense and obvious solution, but it is in fact not common. Finally, the cost of these pumps does not mean they are under-engineered, but rather the competition is just overpriced. I now have a DCP6500, this is the quietest pump I have ever run, I do not hear anything, but I am running my 180 gallon tank and 30 gallon sump at 1631GPH with no noise, no heat and no problems.
I have upgraded to keep up with evolving technology but my first DCT, I just gave away after about 5 years and its now at use in a sheltered location running a water feature in an outdoor KOI pond. My 7000, I just replaced because I was enthralled by being able to control my flow rate from 30 to 100% in 1% intervals and also track the watts used by the pump and have the ability to install a wifi controller at very little additional cost in the future. I have purchased from FishStreet and other vendors but, I like to use local vendors because when I have a question with FishStreet, I have to deal with a language issue sometimes. FishStreet now does have local distributors so I can get the prices without a delay in delivery or a language issue.
Yes, I do see a number of pumps and it would be easy to ascribe copying, but neither I, nor anyone else here can make such a statement and prove it. In fact what I have observed, is more in the nature of 'form follows function'. I have no axe to grind, nor any need to proseletize, 'To each, his reach'. But, if you are wondering whether to try out one of these JEBAO or JECOD pumps, the costs are not prohibitive and the performance is incredible. Don't allow the 'nattering, nabobs, of negativism' deter you from doing your own testing, then posting what you know, not what you may have heard. Let's spread light, not just hot air.