Combination ladders question.

Does anyone other than Mr. Fetty use one of these?
If so! What brand do you recommend and why?
I like the configuration of A frame with an additional telescoping section (second image).
It appears great for accessing roofs and attics…Huh?
Thanks in advance.

http://cdn3.volusion.com/zdsjj.aemfk/v/vspfiles/photos/LADDERCL21-AP-4.jpg