ladders
For what it's worth... I am an interior painter, small one man show, quality not quantity. old school brush and roll guy... I have used all kinds of ladders, big and small. I'm a big guy, 6-4, 270lbs, so I need a real ladder but I don't want to work harder than I have to moving them around...Depends on what your doing. My ladder work is usually in entry ways, stairways and rooms with high ceilings. I don't like ladder work but until I win the lotto that I don't play, it is a reality sometimes... I am not a fan of the ladder in your post. I have seen many of them in the cobwebbed garages of my customers/friends. Out of curiosity, I have played with them and even tried using them. Boy, are they heavy, cumbersome and all the levers and knobs to move the pieces, you better watch your fingers too, not for me. Again, depends on what your doing.
For me, the strongest, lightest, most simple ladders are best for me. Those would be 4-6-8 foot A-Frame step ladders(fiberglass) and the shortest/strongest extention ladder(aluminum) for the specific application, usually not to exceed 14-16-18 footers. Correct ladder placement and ensuring they are square(A-Frames) is critical... Aluminum extention ladders are strong and light and reasonably priced.
Unlike most of my competition, and really I don't consider them competition because most don't do what I do. No, I am not patting myself on the back, I just mean that you don't find many specialists any more for a bunch of reasons probably. I am a simple man, I know less about most things than most people. To combat this on a professional level I stick to what I know I'm good at and don't pretend to be something I'm not. (or atleast what I have convinced myself that I'm good at/I only have to fool myself...haha) The few tools I buy(and I am a cheap bast+rd to be sure), I try to stay away from the all in one/as seen on TV stuff...
I have been a member for a few years. I lost my Dad 3 years ago to pancreatic cancer. He was/is my hero. I am lucky to have his (old black car) in the garage. 2door/HT 57. I surf this site all the time to try to learn and soak up the wealth of knowledge that's available. PLEASE BE CAREFUL ON ANY LADDER YOU CHOOSE,USE.