I'm going to throw my $0.0002 here b/c, well, everyone else is
When I went to buy a first, new tank last year, I originally was going to go with Red Sea. I had scheduled an appointment with my local fish shop to spec it all out. The night before, I was up all night reading various threads, and came across a thread of a Red Sea purchaser who had what he believed to be a problem with this tank. The thread was very detailed re: the course of events, communications, etc. with Red Sea in trying to resolve the problem. Frankly, it wasn't the problem itself that made me decide not to purchase the Red Sea tank, it was the way the communications and the customer complaint was handled by Red Sea. To me, it was very clear that Red Sea neither stood behind their products nor cared that the customer was actually satisfied with their purchase. Yeah, I went elsewhere for my tank.
For those saying, "well this was second hand, and everyone is just bashing Red Sea," you may be right. But when enough people start complaining, you/we can all bury our heads in the sand and just say "well, who knows, too many unknowns, too many circumstances, so no problem here," or we can say "maybe there's a problem." Ultimately, it's going to be up to Red Sea to either deal with all these complaints or just let us, as customers, draw our own conclusions. And rightly or wrongly, when there are so many posts of Red Sea tanks failing, I think it's safe to say it's going to cost Red Sea some tank sales. Maybe not enough for them to care, but, if it's really a consistent problem, then eventually it will hit their bottom line. I, for one, will not take that gamble, especially with a company that seems to clearly be uninterested in the customer's actual satisfaction with their product and so unwilling to stand behind their product.
Additionally, if product manufactures don't design their products with some degree of reasonably anticipated consumer abuse (e.g., moving the tank, not having it perfectly 100% level, cleaning it incorrectly, etc.), then they'll need to accept the results from normal customers using their products normally (which most assuredly means their product won't be used perfectly).
That Red Sea is deleting negative posts rather than actually addressing the issue tells you alot of how they view their role in all of this and how much respect they give to those who use their products.