That looks like a Silky Hayauchi....a fragile tool of poor design. at least the first generation that I had. It is now slightly improved. I now have a 20' ARS, private labeled as Stihl. It is fairly well designed, though a bit heavier than the Silky. Silky's new Hayate is heavier than both, supposedly well designed, but pricey.
I also have and like the Silky Zubat pole saws, that are real light, with but two extensions, and come in 9-13 foot fully extended versions.
I, as most arborists, have always used Jameson pole saws, with the clip together 4, 6, 8, and 10 foot sections. They are cheaper, work well, up to 16 feet long, but aren't as rigid as the aluminum Japanese saws, and are heavier.