I will comment on the experienec I had with them over 6 years ago. I worked at a LFS that sold both Perfecto and All Glass. For every one All Glass that was returned as defective/leaking, we had 10 Perfectos. Bear in mind, that was 6-8 years ago, so things were different. And I was dealing with smaller tanks, but this is my experience.
I have seen some larger perfectos that were quite sturdy, though.