I have purchased this exstention tent for my Octogon cortes and i am over the moon with it.
however i looked up the coleman video on youtube to show you how to erect it and i MUST say DO NOT try doing this the way they show with the poles in !!!
you will never be able to pull the cover over the back of your tent as the two poles red and black lay against the tent and stop you from pulling the rest of the shelter over !!
pull the shelter over the tent first and peg out the back guy ropes to secure and then put in the poles and the rest is EASY !!
And one other thing !! lay out the ground sheet for the shelter in front of the tent first and then work out how far back you can pull the sheet otherwise you will lose a good few inches where the ground sheet wont fit the exstention and the porch living area seems small