Zinus WonderBoxTM Smart Box Spring, Full, Grey

easy to assemble, great for the price

The Positives: -It was pretty simple to assemble (or would have been see cons). Just 6 screws. Straightforward instructions. Minimal parts to connect. -It feels solid with two adults and a child in it. -Not Noisy so far. Silent in fact. I was concerned about it being noisy so I added electrical tape at all metal to metal contact points. Particularly the end of the cross braces. This made things fit tighter and there shouldn't be any metal rubbing together now. Can't say this made the difference but it is quiet. -Price. Local retailers were quoting me 2-3 hundred for a traditional box spring. Apparently they aren't commonly used anymore which is the reason stated for the high prices. -The cover was easy to fit. It's basically just a fitted bed sheet. Cons: -No surprise, the metal is the typical cheap Chinese pot metal. -The machining for one of 6 screw holes was missing most of it's threads. This made it impossible to assemble using the screws provided. Thankfully I had a box of nuts and bolts and was able to complete the assembly without the screw. -Two of the cross braces didn't have the plastic grommet in the end of them. This would have meant extra metal to metal contact. I remedied this by fashioning my own grommet out of furniture foot pads. I shouldn't have needed to do this but I'm sure it will work better now anyway. Tip: Use electrical tape at all metal to metal contact points to avoid noisy metal to metal friction. This was at the end of cross braces and then the center contact point where 4 screws are connected. Summary: It was a very cheap solution that seems to solve the problem. If you don't have a little Macgyver ability you might want to avoid this. The quality of the material and machining matches the price. Ease of assembly with simple instructions is a plus. Will update if the thing falls apart. Update 3/4/26: Still holding up. Haven't had to tighten anything and it's still quiet. Keep in mind though that this is being used for a childs bed but Mom and Dad do spend a fair amount of time getting in and out of it.

I would buy this Zinus Wonderbox before spending money on an traditional box spring, going forward. Lightweight/space saver- it'll make moving much easier.

Product arrived in a fairly beat up looking box. It had a couple other shipping labels on the box that had been blacked out with a sharpie, so I’m guessing this kit had been returned at least twice. Hesitantly, I opened the box. All of the pieces were loose. Everything was in the box except a few of the plastic end caps for the cross supports. I assembled the frame fairly easily. It seems fairly sturdy, although I wasn’t a fan of the cross supports being hinged together with a pop rivet. The cover is not all that impressive. It is simply thin elastic fabric, which is hard to tell by the product photos. It’s better than my busted traditional box spring, so time will tell how this one will hold up.

I’m extremely happy with the ZINUS 9 Inch WonderBox™ Smart Box Spring! From the moment I opened the box, I was impressed by the thoughtful packaging and clear instructions. Assembly was quick and straightforward—I had it fully put together in under 30 minutes with no tools beyond what was provided. The build quality is excellent. It feels sturdy and supportive, with no creaking or shifting under the mattress. The 9-inch height is perfect—high enough to provide great clearance and support, but not so tall that it raises the bed too much. One of the standout features for me was how compactly it ships. It’s amazing how a full box spring fits into such a manageable box. This made moving it through doorways and tight hallways a breeze. Overall, ZINUS really delivered on both convenience and durability. If you’re looking for a reliable, easy-to-assemble box spring that doesn’t sacrifice quality, this one is a winner!