Hello just thought I would chime in. I got one of these OG's on ebay for $237 shipped.
http://www.youtube.com/watch?v=aza5lHPV0mQ&feature=player_embedded
I have ran it through a couple of grow cyles and all I can say is WOW!
Also I think Sun Systems is ripping them off because the patten has only been filed on it and not in place or enforcable yet.
And as far as the vertical Horizontal argument goes, Just from my years of growing I would run Vertical 42-48" Parabolics any day if not for cooling issues. (Better Yeild) from back in the good old days when air cooled reflectors were non existant.
Parabolics are as close to mathamaticly perfict as it gets. The OG is basicly an air cooled Parabolic. this light is a true pennitrator. If your gonna grow trees run this. If scrog I would stick with the xxxl.
and no I cant get my spell checker working