I just got some of the Toddler size AIO's and I was pleasantly surprised. I had heard awful things about leaks and a terrible fit, but I got them as a gift and decided to give them a try.
They are definitely not my favorite diaper. I would not recommend them as the main diaper in anyone's stash. There are tons of better AIO's out there. However, for the money I don't think these are as bad as some reviews make them out to be. They are an inexpensive, functional, "good enough" diaper for occasional use.
My DD is tall and thin and 26 pounds, and the fit on these is okay. They do gape a big at the leg openings, but my DD has solid stools so we aren't worried about leaks. These would hold softer stool in, I think, but DD hasn't put them to the test. These are really big in the waist for DD; I have to cross the velcro tabs to get it to fit. So these would work well on a chubbier toddler.
They are not for heavy wetters or super-soaked situations like nighttime, unless you add extra absorbency, but they can last my medium wetter more than two hours during the day, which is pretty good for an AIO with no doubler. The flannel inside is soft.
These do not feel nice on the outside. They are stiff and vinyl, and I would guess that on some babies you would get awful red marks. However, they are narrow enough between the legs that my DD is comfortable in them, and they are not overly bulky so that most of DD's clothes fit easily over them, which is not the case with a lot of the diapers we've tried. We have had no red marks.
I don't think these are hard-wearing diapers, like the kind that will last you through all your babies. Also, they take forever to dry, but that's the case with many AIO's.
All in all, I'd say these are the bargain-basement of AIO's, but if you just want a few AIO's to round out a stash, and you don't have a ton of $$$, you might consider giving these a try.
I have not tried the infant size of these, but I've seen them on a friend's 3-month-old and they seem huge and hamper the baby's movement. I don't think they would work on a newborn. Haven't seen the infant size on a larger baby, so I can't comment on that.
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