ok, looking around I've found a dark room wide, not square at all... 120cm long, 60cm wide and 160cm tall. looks pretty good.
I'm using the "china" brand..so far have 2 4x4 and a 4x8 with another 4x8 on the way...cost about half as much as the "big names" and so far have not let me down. Obviously the big name ones are better, though.
what about lighthouse hydro tents they seem cheap made in the usa mylar non toxic and very durable the 4 x 4 is a very decent tent i can say that the 4 x 4 was only 99 bucks
i have a SJ and love it but found this tent while looking at LED's on Gotham Hydro web site.
http://www.gothamhydroponics.com/growtents.html
their tent looks like a better version of the SJ but much cheaper on price.