I just spent the past 3 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 box.
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). It is a crime that such a shady company is still in business.