Note: This is for the small double that includes the electronic lift.
The bed looks great, and is of a nice quality. It was easy to assemble, too, with the pieces slotting into place. A few bolts were a little tough to line up and tighten, but nothing major. The base boards are thin and I'm a little wary about putting too much weight on them, but they're fine for clothing and light goods, or heavy items with a broad weight distribution.
The most complicated part was the electronic lifting mechanism, but it was well worth the effort (and extra cost). It lifts high and smooth and gives decent access to the foot end, and just looks neat rising up on its own. The head end has a bit less access due to the lifting angle and the mechanism, but that's the same for any ottoman that lifts in this way.
Most importantly, the base for the mattress is solid and firm, and should support the firmness of the mattress. No slats, a solid board. I'm very satisfied with the purchase.