I 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.