I was thinking about buying one of those also but I decided to build my own and spend my money on lights ect.... Dude i built a box out of 2x4 for the frame and put a thin plywood on the box to close it up with a simple door on hinges. I have a light box that is totally separate that mounts on top of my grow box and had a local place cut a piece of glass to keep the lightbox and growbox seperate it also has a 6 in 280 cfm air duct fan from home depot ($25) at the very top.... In the grow box I have 2 intake comp. fans at the bottom and 2 air out fans at the top (opposite sides)(Fry's) My temp is 75-78 max 70-72 at night... Spent a lot of money on fan's, Nutrients, lighting, bulbs, mediam, set-up ect.... But I was glad when it was all over I built my box for under $150 and could buy some extra nutrients, and supliments. My clone started out with 100watt MH, and when I transitioned it for a week or so i added a 70 watt HPS in there...... When I went to full flowering I added another 150 watt HPS... So I have 320 watts and only one plant..
My boy has 8plants with 600 watt HPS only for flowering and 400 MH only for veg., I do not think 250 will do 6 plants but i also dont think 6 plants will go well in that bloom box.. I would rather have 4 good healthy than cram 6 in and hope it doesnt get 2 crowded... Just my 2c good luck bro.....