I purchased the small double for my spare bedroom and I am very pleased with it, especially at this price.  Not the greatest instructions and arrived in many separate boxes, but it was fairly easy to assemble and looks really nice when finished.  The dark stained pine is soft and easily dented, so you need to be careful when connecting the joints and hammering in dowels.  It is helpful to have an extra person when attaching the sides to the ends but other than that it can be easily constructed by one person.  The slates have to be screwed in individually, which is a bit of a faff (48 screws!) so allow extra time for this.  All in all, I would recommend this.