I've never heard of this greenhouse before and it seems to be a relative newcomer to the marketplace. $998 is a nice discount from the original $1400 price but I'm not sure it's even worth $1000. It has two vents but they are not automatic. At 8x12 it is 96 square feet.
Really, I can't see what this greenhouse has that's better than the infamous HFGH Harbor Freight 10x12 (120 sqft) greenhouse.
http://www.harborfreight.com/1...
The HFGH is $680 plus $90 for shipping = $770
Add four automatic vent openers ($26 each)
http://www.harborfreight.com/g... and you're now at about $880. That's a $120 savings from the Palram one, and is bigger with automatic vents.
I think if I was looking for a ~$1000 greenhouse, I'd look at the harbor freight one.