I bought an 8 x 10 Hercules at the end of last year and I absolutely love it, love it, love it. When I had the Belbin tests done (sorts out work personality types) I came out in equal measures as a team player and a "resourse investigator" - in other words I get to find out about things. And its true. I cannot buy anything or do anything without doing my research first and I spent bloomin ages going through the catalogues working out which was the best deal. (It took me 6 months before accepting my husband's proposal and he really was the best deal!!!). I looked at the Rhino and nearly went for that except I don't live in a hurricane zone so it was a bit over the top really...and more expensive. I looked at everything but I wanted green (I'm a libran so everything has to look pretty - sorry guys) and I wanted automatic vents and a couple of louvres and a double door. When I totted it all up, it was cheaper and less hassle to go for the Hercules. It wasn't cheap though and I daren't say here what I paid for it (but I'm not into designer gear, flash cars etc so what the hell). You will be able to see on the greenhouse people's website what they are worth. All I can say is I think it was worth every single penny so if you can get a ggod deal - go for it. I'm fairly sure the instructions for erection are on the website but they are a great lot and I'm sure they would send you a set of instructions if you asked nicely.
Good luck
Jools