I only own two of the 620's (I think that's the number
) Your pros and cons list looks pretty good so far (no experience with the big models) But I personally don't find the flow to be like laser . I think the flow is spread pretty widely and not just a steady stream either. Just thought I would toss that in... I have very few issues with mine.
When unplugging and re-plugging the units back in, they sometimes start off rough (makes a clicking sound) and sometimes can take a few seconds before they start. When this happens I have also noticed on several occassions that (as the pump gets broken in) that when you unplug it, and plug it back in.. sometimes the power of the flow is completely different. Not significantly (sp?) but noticeable for sure. Maybe this is due to me using lots of power outlets though (but with reefs all of us are using lots of plug-ins) But I thought that was kind of weird.. I have re-plugged it in and out to get the max. flow from it.
And now that you've said it.. you're right. The power cords are way too short. The power outlets are on the right side of my tank, one Seio is on the left side.. the cord JUST barely reaches to the left side of a 24" stand. Pretty short....
Other than those small things. The Seio is indeed a great PH for the price.