Well I thought I would post an update on our experiences since we got our tanks on Friday.
We ordered 2 tanks from GlassCages. The tank quality looks awesome. The silicone work is very nice and you almost can't see it. We will need to do some cleaning up along the bottom because it doesn't look like either tank got trimmed. That's not too tough to do though.
I have talked to Donna many times at GC and she's always very nice. You have to get passed her rough demeanor but I feel like she really goes out of her way to make sure everything runs smoothly.
The truck driver was interesting. Typical hillbilly but very nice. The website says that he will not help you move tanks, so be expected to move them yourself. He helped quite a bit and picking up the tanks didn't take much time at all.
The only part I don't like is the overflow. They used 1/2" glass for the overflow also, and I feel like the overflow is just overly big. Then if you want teeth on your overflow, you can purchase an acrylic piece that slides over the glass. So we're talking 3/4" thick overflow and a really big box. Each overflow is 10.75x7 to house a 1" and 1.5" schedule 80 bulkheads. I kind of wish I had asked them to skip the glass and I could just silicone in an acrylic box after the fact... and save a ton of room.
Now I also got the chance to see a Great Lakes aquarium and I have to say I was not impressed. The silicone work was very rough and the black trim on the sump could almost be lifted right off. I would have been very upset if I received tanks of that quality. I'm very glad we went the GlassCages route rather than GreatLakes.