Nothing wrong with glass cages at all IMO. At least I have never had an issue with them, but I have read some pretty bad stories. However when doing a new, modern reef tank, machined edges on the glass were mandatory for me as well as the extra fit and finish quality. Glass cages last time I delt with them could simply not do machined edges. I did not want just a decent glass box that holds water. For the exceptional tanks, I looked at Miracles, age and lee-mar. In the end, I personally went with lee-mar as they were a lot closer to me and shipping was cheaper. Also looking at their tanks in stores, they were TOP NOTCH. The tank I received was in fact exceptional. Fit and finish was what I consider flawless. The only thing I was angry with them about is they did not follow my exact instructions which were crystal clear on what I wanted done to the euro brace. It was not a big deal but when spending that sort of cash on a glass box, they should have asked "how high" if I asked them to jump. The store I purchased from did compensate me.. lightly for not following my exact instructions so that was good enough. I still look at the euro brace and since it is not exactly what I asked for, it irritates me still but no one else would ever see it or know lol