I have a DR-80 darkroom 2'8"x2'8"x5'3" tent made by SecretJardin. It is about 11 yrs old. I bought it used off ebaay for 50 bucks or so in 2009. It hadn't actually been used, but had been opened, set up, and re-packed. The poles appear to be galvanized? and they are starting to rust a bit. I may tear it down, clean those up, and paint the poles with some truck bed liner. It has plastic corners which are still holding up fine.
I'm pretty happy with it. The zipper has 2 pulls, the top one is corroded and was giving me some problems. I dont use the top one any more. It had one pin hole when I purchased it and a piece of black electrical tape fixed that. It has been bumped and pushed out of the way more than a few times but has taken a beating like a champ. Literally hundreds if not thousands of clones have passed through that thing. Along with probably 50-100 mother plants, mushrooms, a wide variety of lighting, fans, trays and bubble cloners.
Overall my rating is excellent. I mean $50, 11 yrs, minimal problems and only a few minor pin holes.. I really don't think I could ask for much more.
I dont know anyone else who uses one personally. So I really have nothing to compare it to other than what I see online. I'm not even sure they are still manufactured.