Let me start by saying these Medline underpads are NOT heavy-duty incontinence pads. If you're expecting something that can handle a full bladder accident, you'll be disappointed. But for small leaks or as a changing pad liner? They work surprisingly well!
I've been using them primarily for my newborn during diaper changes. The quilted topsheet feels soft against baby's skin, and they absorb pee quickly when he decides to surprise me mid-change (which happens more often than I'd like to admit at 3am). At about 20 cents per pad, I don't feel guilty using several at a time.
The waterproof backing really does protect surfaces - I've tested this extensively on my changing table and even my couch during tummy time. They fold up tiny too - I keep a stack in my diaper bag and they take up less space than a pack of wipes.
Now the downsides: These are THIN. Like, 'can see through them if you hold them up to light' thin. The absorption capacity is limited to about 4oz of liquid before leaking occurs. For my small dog's occasional dribbles or baby changes they're perfect, but for heavier flows you'll need multiple layers or a heavier-duty product.
Final verdict? These are budget-friendly liners that excel at light protection tasks. Manage your expectations (they're not hospital-grade) and you'll find them incredibly useful for minor messes.