It looks pretty good actually. It will keep the point of draining up above the drilled hole. So at most if your return pump fails it will only drain down a little water. If the overflow clogs a bit, water can still flow into the top, but it's screened so you won't get fish suicides.
I've never seen that, but I'd rather use that than the simple screened bulkhead.
It will likely still gurgle, burp and slosh, but it's much simpler than a Durso style drain.
Sounds like a nice way to not drill the bottom of a tank and have large overflow compartments. My overflow towers take up a lot of space. Having two of these would have been awesome IF they work as expected.
$80 is a bit steep. However, nothing in this hobby is cheap, except crappy stuff.
Heck, I blew $80 on a bunch of Berghia Nudibranchs that lasted all of 2 days.
I would actually consider using one to connect two sumps together (for me, the POS stand I have is so overbuilt that some stupid support posts prevent me from building and using one large sump ... as it might fit, but can't actually be moved into place).
So have the drain and skimmer flow into one sump with that thingy in it, but pipe the flow out to another sump that has a fuge and return pump in it. (instead of one large baffled sump). Hmmmm... makes me think ...
(Yes simple bulkheads would work too)
V