I'm sick of these old giant Tunzes blocking light and taking up too much space in my tanks. But, they work all the time everytime. I don't have to replace anything on them and they don't die. I have the real old ones with the puck and metal control box. 6000 and 6100's. So...

I really like the small footprint of the wet side of the MP40, but I'm always reading about people having to replace different parts on their's.

Are these reliable?

Is there a specific model that is less reliable and prone to problems (year/model/etc.)?

Do they clatter in the tank? Tunzes are silent.

Are they worth the $465 and is there a place that's cheaper than Champion?

Thanks,
tom