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The ab roller is fine, gets the job done, the steel rod and the foam slip on handles are sturdy and comfortable when in use, and the ball itself is visually appealing and strong, it's not rubberised but when in use, the downward force is enough to stop it from slipping. I'm not sure if all ab rollers allow for it to be so easily disassembled but this one allows for the pipe and ball to be quickly pulled apart and shoved into a bag for easy access at the gym. The only negative is that its price is almost double that of the ab rollers at my local Kmart, being 18.99 is a bit too high for a plastic wheel and a metal pipe, but other than that, its fine
Pros: It is NOT assist. So far, it is the widest non-assist ab roller I could find. Handle grip is great, comfortable, and give confident. No issue with them. The ball tread is rubbery works great on mat and carpet.
Cons: When going left or right, the tread will move around. It will not fall off but it is noticeable. On wood floor, the rubber tread itself is not thick enough and the ball is not wide enough so you can't put as much weight onto the ball going left or right. This ultimately mean your angle has to be very conservative or else the rubber will lose grip and you'll slip. On mat and carpet, this is a non-issue.
Overall, I'm keeping it. Outside of wood floor, this thing is perfect and fits my need. It is much better than those 2 plastic wheel ones. If you're considering those for any reason, including cost, just buy this product cause it is well worth it.