I'm new to growing with a tent. I have a Grow Lab tent which I purchased after buying a Jardin Secret Darkroom because when I attempted to put the Jardin together it ripped in three places two of which were zippers. The store needlessly to say took it back and for just a few bucks more I got the Grow Lab which is far and away a better tent. It's a 27x27x72 and I have 4 plants in 3 gal smart pots all doing quite well in this their 2nd week of vegging.
After using a 1 x 1 x 2m(LxWxH) tent I can't say I would recommend one. Anything with solid walls is going to be more versatile, these tents are a stepping stone at best.