Size - the Xtrabed is half as tall (43" full size, 46" queen size).
No Installation - Some folks have an obstacle (of any kind) the makes bolting a conventional wall bed or Murphy bed (same thing) into their house.
No Assembly - Much like the 'no installation' - the Xtrabed comes right out of the box ready-to-use. (This is not an Ikea product!!)
More Economical - The Xtrabed includes a memory foam mattress, and when you consider that, with the Xtrabed, you don't have to buy a new mattress or pay for assembly and installation - the Xtrabed is about half the cost of an installed Murphy bed.
It's Mobile - ONLY the Xtrabed allows you to store the bed in one room, and roll it into another room. Sometimes the place where you have space to put it against a wall, is not the same room where there is space available to open it up and sleep on it. No problem with the Xtrabed!
Xtrabed is Well-Made - The Xtrabed has a lifetime warranty, and is made of real Birch solids and veneers on Plywood core panels - no paper, no plastic, no particleboard!
Hidden Wall Bed - unlike a conventional wall bed or Murphy bed - the Xtrabed looks like a beautiful chest of doors, just sitting there looking like a pretty piece of furniture - until you roll it out and open it up! It doesn't sort of 'take over' the room with a massive 84" height like a conventional wall bed.
So, to sum it all up, Murphy beds and Wall beds are great - but some folks need a mobile wallbed that does what a Murphy bed will do, but without all the size, installation, and cost issues.
Thanks for reading!
jeff