Fingers crossed mine works well. I too have a few extras. I’ve also had a few of the smaller sicces and they have always been very noisy despite how quiet they’re supposed to beI have the IM Nuvo 10, 20, 120, and had the 40. The 538gph mightyjet is a decent pump. It replaced the MJ1200 as my universal use pump and I always have a few laying around JIC. The 328gph is temperamental at best. I’ve gone through 3-4 of them now on my IM10. It’s the flow for the entire tank so when it goes it’s bad. Sometimes I can just shake it and it starts flowing at full speed again, sometimes I replace the controller, sometimes the whole thing.
I actually have the Sicce 1.5 sitting next to it but I recently read reviews about noise and it’s a lot of work to replace if it hums.