I bought a innovative marine 100ext and I think it’s very well built and I’d consider it mass production. I was surprised with the 1/2 inch glass the seals and the aluminum stand. The 150, 170 and 220 or 250 not sure which size but all those have 3/4inch glass and the sumps they make are really nice to I’m not trying to say there the best or anything so don’t get that thought I’m just saying I was pleasantly surprised and if you’ve ever seen one in person the 100gal or bigger not the lagoons they have smaller sumps I think you might agree they are well built. I do agree they are not cheap but the if I had a tank and was sump shopping I’d want one from them I’ve had trigger and advanced acrylic and IM makes em look like a cheap eshopps. Probably seems I’m biased but definitely not just giving me 2 cents about mass production tank that’s very well built