I had one some time ago and didn't have any issues with it.
Silicon was a little sloppy, but It was VERY sturdy.
I believe you'll find mixed reviews.
I don't believe they will fail.
On the other hand they aren't the prettiest things around either.
My only experience has been good. I bought a 180 about 11 years ago. It is still up and running, no issues. Bought at a LFS going out of business, so not directly from GC.
Had a rimless from them. Get black silicone. Since it shows, they keep it clean. They are built to last. Overbuilt with thick glass. I would but again if I was looking.
I thought that statement was pretty self explanatory. I got a 40B from them. They used thinner than standard acrylic for the size of tank. The seams were terrible! I could've done a better job. Luckily, it didn't leak but I got rid of it pretty quickly before it had a chance to become an issue.
I think you'd find people to say their older stuff (older than 5 years) was very good and high quality. Anything within the last 5 years...not so much. I know of one member that ordered a tank about 2 years ago and it took 6 months to get it and then it failed within 3 months and they wouldn't warrant the tank because he went there and picked it up instead of having it shipped.
I'm one of the apparent fortunate few. I have a 30g frag tank it's 48 x 18 x 9 with a corner overflow and has been an incredible frag tank. The silicone is far superior to my Marineland 120g DT. I have been told many times I'm lucky. So take the info for what it's worth.