I use Matter for quite some time now. It made me read more, and it made me discover high quality content. It's not only read-it-later, but also ever growing collection of curated content online.
I'm really enjoying the easy save for later and the queuing. It keeps me focused on what's importante without losing new and unexpected content. The audio feature was something I was really looking forward to, but it keeps breaking down and coming back every minute or so and I can't seem to adjust the speed. I really hope it gets fixed :3