Okay, so I've been using this ab roller for about two weeks now, and here's the tea...
First off - THE WHEELS. They're not those cheap flat ones that get stuck. These actually roll smoothly on my hardwood floors (bonus: no scratches!). I did add some nylon washers like one reviewer suggested, and wow - it glides like butter now.
The knee pad? THICC. Like, actually comfortable when you're doing those painful roll-outs. No more bruised knees from my carpet!
Assembly took literally 30 seconds - just pop the wheels on and you're good to go. The foam handles have this nice squish that doesn't hurt your hands during longer sessions.
Is it professional gym quality? Nah. But for home workouts? Perfect. My core is already feeling stronger, though I definitely don't have 'awesome abs' like my friend yet (that's the goal!).
Only con - the plastic feels a bit cheap if you really examine it. But hey, for this price? Can't complain!