Well, maybe I'm just unlucky. But I have this tank in front of me - the bottom is 1-2mm bigger than sides (not flush with sides), sides again 1-2mm higher/lower than front/back, glass cutting quality is poor, so I can't be sure there's even layer of silicon everywhere. I mean it's "ok", I don't think it will break or leak, but it's not a nice clean aquascaping tank I was after, and not a quality you'd expect from a person with many years experience.
I didn't come here to write bad things about Greg, sorry if it was inappropriate.