Hi, I have had the IM 75 gallon and now have an IM nano 10 gallon. I do like them, they are just different. I found it is best to put a screen on the intake to not suck in small fish if you have them. Siphon out the back sump area periodically keeps the pump and sump area cleaner. No pump noise from either, very quiet. Kind of a pain to remove and clean pumps, but then again, canisters can be annoying as well. On the larger one, you can add spray bars, customize the nozzle, etc. but not quite as easily as you have to match the pipe sizes. I did add a powerhead close to the bottom to get better water circulation as my tank was heavily planted and tended to get dead spots. Don't put it too close to a wall or too high as it can be hard to get inside the sump area to clean or change out media. Nice, clean look.
Fish+Plants thanks you!!