Anyone used one of these telescopic ladders?

The main use will be cleaning/repairing gutters, don't need to get on
the roof. I have a suitable double extension already, but sometimes
getting it through the house to the back is a problem.

So, what height do I need? They seem to only go up to 5 metres.

Also, I understand that you extend them from the top, upwards. If I want
to use it at half height, will the bottom portion prevent me from using it?




--
Dave
The Medway Handyman