As my daughter has gotten older and her poops more solid I have found this to be essential in our diaper bag. She poops at a similar time each day now and so I don't have to use them all day. The amount of solid particles they collect is impressive. My diaper sprayer isn't getting near as much use as it used to.
This product is the reason I was confident enough to switch my toddler and infant from disposables to cloth diapers. I have always been interested in cloth but the idea of using a sprayer or bleaching diapers regularly was a huge turn off. I have a friend who referred me to GroVia diapers, and she showed me how bioliners collect solids from the diaper while still significantly reducing waste output from diapering. Bioliners work great and rarely move around once the diaper is on the bum.
Bought these to convince my husband to cloth diaper and they are by far the best of any brand we've used. Soft but strong. Generally they don't rip except where perferrated (we only had trouble with 1 roll out of all the ones we've used over the years). I also like that if they accidentally end up in the wash (which happens more than I like to admit, especially with daycare diapers), then they don't totally disintegrate in the wash. I don't flush these, and personally wouldn't recommend flushing them, especially after seeing them make it through a wash cycle.