Seems reasonably solid once put together, but a few issues:
1. The support in the middle doesn't reach the floor (see picture), so probably won't be doing that much supporting - I improvised a solution to add the extra height required.
2. A couple of the slats were bowed, so I had to put some extra screws in to keep them in place. The single screw supplied just kept popping out under the pressure.
3. The wood was quite knotted in places and there were small cracks emanating from them. I'll wait to see if this causes any issues or not.
4. Some of the holes weren't properly pre-drilled, so I had to finish them off myself.
5. The underbed clearance might be correct, but the side panels mean it is lower clearance than advertised if you're putting stuff underneath. Worth noting - we intended to put 26cm high plastic storage boxes underneath (clearance says 28cm) but couldn't.
6. Probably to be expected given the price, but the drill holes on the slats aren't recessed, so you may find that the screw edges catch on the mattress unless you turn them in really tightly. Again, I used my drill to solve this, but it would've been nice for it have been done already.