This thing is NOT a substitute for fiber! That said, as a healthy person that eats lots of veggies, I noticed an immediate difference using the stool. There are two huge advantages. First is the time it takes to poo. My routine used to involve messing around on my phone checking emails and reading blogs for 10-15 minutes. With this thing, you will poo in only a few minutes. Seriously. Most of the time it takes like 1 min. The other big thing is the 'unfinished business'. My poos would occasionally end mid-turd, and I'd either sit there for a long time trying to squeeze it out or just cut it off with heaps of TP. Then you feel dirty for the rest of the day. That really doesn't happen with this. When the poo is done, it pinches off nicely. Mostly all one-wipers. BEFORE YOU BUY THIS: try using an ordinary stool, or a carboard box, or coffee cans, or anything to get your feet up 8-10 inches off the floor and see if it makes a difference for you (it will). Everyone should be pooping in a squat position, whether you buy this or not.
This product is a little expensive for a simple plastic stool, but anything else is going to take up space in the bathroom and get in the way. If you are like me, then your bathroom is tiny and you really don't have any space to spare. Overall: great product, does what it says it does, definitely worth the money