X2, just saw one at my Electric Supplier for sale. Dont know if i would like it or not. Every now and again i throw my leg over the top and place my foot on the rear brace and straddle the top for better stability for when the ladder is too short or i want a better angle on what i am doing. It must be safe because i am not using the top for a step :whistling.
I have several 3 legged ladders, tallest is 12' high. Also have several 4 legged ladders.
The main advantage to these ladders is they work well on uneven ground, whereas a 4 legged ladder is not very stable unless it is on a flat surface. The other advantages already mentioned like getting into a corner, etc. The disadvantages are they are wide in taller heights, don't stack very well on the truck, etc.
Now the older wood 4 legged ladders may not be OSHA approved, not sure. And I heard that Red Top ladder, one of my favorite wood 3 legged ladders can not get insurance anymore which may have something wiht being approved.
But Werner 3 legged ladders are OSHA approved, see link below.
I have had a 6' Green Bull for years. If you don't have one consider adding one the next time you are looking at a 6'. They do Alot of things no other does. Framers can put the single leg through a stud wall and be right at the top plate. The foot print is actually "T" shaped. They are VERY STABLE......I don't use it much anymore because tile keeps me down.
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