We have the small Thirsties fab doublers and they are exactly what I was looking for. I needed a daytime doubler for my heavy wetter. All diapers would leak on him and while I use a generous hemp doubler at night, I needed something small and trim for daytime as I didn't want him to wear a mountain on his bum during the day, especially when going somewhere. These are perfect! Just the right amount of extra absorbency placed more toward the front for a boy and it equals an extra hour in a diaper. I often use them inside the tunnel of the Thirsties AIO, it's a perfect combination. My stash is made of a lot of different diapers, but I definitely wouldn't mind if it was all made up of Thirsties AIOs with the Fab Doublers.
We line dry our diapers at home, so these become somewhat stiff after washing, shouldn't be an issue if you use a dryer. But this doesn't bother me and doesn't affect performance at all. I love the colors, it makes them easy to spot in my large stash among all the white microfiber inserts! Saves me a few minutes a week looking for an insert I'm sure ;)
Bottom Line Yes, I would recommend this to a friend