My Dad has just ordered one of these systems. The poles come in 5 foot lengths which I think is a good length, each one weighs a kilo, I believe that they come as standard with 4 lengths which will just get you over a small conservatory. What you need to keep in mind is that each section weighs a kilo so the more you put on the heavier the pole will be. My dad ordered 6 sections for a length of 30 ft but that means the pole will weigh 6 kilos if you use all the sections at once at an angle that would be a killer.
It does seem to be a good company to deal with though, very helpful.
Simon.