Have you ever owned a high quality one? They are completely in a league of their own. Nothing like a t-shirt… or any other cotton product. Many times softer, lighter.
There are different categories of microfiber cloths… there are the flat no fluff… and really fluffy. The later are great for eye glasses and delicate cleaning. Just judging from the photos i think these look like the light fluffy type.
Give them a try, one of the amazing inventions over the last couple dozen years. There is a much sturdier variety for windows… much heavier.