I just spent the past 6 months of hell dealing with Glasscages so I want to add my experience here for perspective. I ordered a 350-gallon glass tank from them in May. They promised delivery in mid June, but when I called in mid-June, they just received the glass sheets. I finally got my tank in late July. The tank arrived with a broken bottom. The tank packaging is beyond flimsy. A heavy glass tank was placed on a warehouse wooden palate, tied by 2 loose plastic cords, and covered by a cardboard box. See the attached pictures if you don't believe that an aquarium manufacturer can be that careless and stupid. I bought my last tank (675 gallon) from Fishtanksdirect, which is acrylic. And it was shipped in a custom-made wooden crate.
After my call, they sent me an email stating that they will replace my tank for free. I had asked them to drill holes for my custom overflow so I had to send them my template. Despite FedEx confirmation that Glasscages signed for it, they lost the template. Afterward, I had to pay for another template, and mailed it to them. Then I heard nothing for more than a month. My assistant called them, and now they said that they only will replace the tank if I pay (but with a discount). Now, they played the victim card, and blamed it on the trucking company. Imagine that you buy fish from a vendor, who shipped the fish without oxygen or insulation, so the fish died in transit. Then the vendor turned around to blame the shipping company for their careless handling.
So now, after 6 months of hell, I have no fish tank. I have a huge broken fish tank sitting in my garage (not to mention a very unhappy wife

. I paid for two overflow templates which I no longer have. And I am at least 4 thousand dollars poorer (tank cost, homedepot truck rental, movers etc.). It is a crime that a shady company like Glasscages is still in business.