Plastic vs Glass Carboy

[Golddiggie]

Actually, instead of fermenting in those, I'd use them for grain storage...

 

[Revvy]

So a guy nearby who's real big into aquariums had a pallet of these, brand new, never opened and for $3 I couldn't pass them up. For a primary, what do you think? Everything I've read from the forums seems to point to them being ok, but the corners could pose a problem for gunk buildup.

http://www.houseofcans.com/gallon-natural-square-plastic-with-p-910-l-en.html

A lot of "no chill" brewers swear by them. They work fine.