The message
from "nambucca" contains these words:

Darren doesn't want to a GH of his own, he's doing a college project
about them.

i dont think
theres much to choose between a DIY store Aluminium frame or a posh
expensive one via a gradening magazine

I suspect you've never seen the more expensive ones irl, to compare
them. They have a far stronger construction frame than cheap ones from a
DIY store (and often better glazing and ventilating systems, better door
access etc). Frame-strength and glazing method are particularly
important in exposed areas.

Janet.