Grow Tent question

I am looking to change my grow room setup for a couple reasons, the main one being ventilation and light getting in for the flowering stage. I came across this setup on ebay

http://cgi.ebay.com/2X4X4-Full-Mylar-Hydroponics-CLONE-Grow-Tent-Room-/280581185559?pt=LH_DefaultDomain_0&hash=item4153f12017#ht_4398wt_960

so as you can see the tent measures 2ftx4ftx4ft and i am running a 400W hps with 2 plants, is this to small or do you guys think it will work well. Also note that this will be in my "backyard" at my apt complex, so i am trying to keep this as low key as possible, thank you

It will work and tents are good for growing, im using 2 myself ..Bouth are SecretJardin Darkroom II, 100x100x200 cm (400w digital cooltube) and 120x120x200cm (600w digital cooltube)

haha that's exactly the same one I have 24x48x48, only thing is the ducting holes came in 4'' so I cut to 6'' to fit the exhaust fan and the ductbooster. so keep in mind the ducting holes are 4'' just incase you have your exhaust already. You can also fit up to 12 plants in 2 gallon to 3 gallon pots