I have a 8X21 Rion.The pluses are 1)inexpensive 2)easy to maintain 3)Function as well as most greenhouses.Now for the minuses 1)must be protected from high winds and secured to the ground well 2)Doors and windows are usually made shotty at best in my experience 3)Replacement parts cost an arm and a leg.I recommend them for first timers unless you have money to burn.In that case,why not go all out and get what will serve you best?I really like Rions but they didn't think things all the way through and could easily improve to make this a great product but its not my company.Hope this helps some.