Full disclosure: I have the Telesteps and have never hesitated to recommend it. I would also recommend the Xtend and climb
This video is entertaining and informative.
As to that Yesker ladder, one of the things I do when shopping on Amazon is to search by manufacturer name, products by Yesker include USB charging cables, iPhone cases, glass bottles with eye droppers, fingernail scrub brushes, pineapple corers, ultrasonic jewelry cleaners, waterproof fitness trackers... While I don't hesitate to purchase Dexter authorized bearings that may be made in China, there are some products I would stay away from.