I love it in nearly all respects except for the bed base.
In the most basic of layouts, the rear seats drop flat and there is an aluminium frame which folds out to fill the gap in the middle and then two bed panels which go on top.
It is reasonably comfortable but it is a bit dangerous. When it folds out the top is a lot wider than the footprint of the frame so it will tilt right over. It is roughly square so I can choose if it tilts front to back or side to side! The danger comes that it falls quite quickly when you move in your sleep, so you move quickly which makes it tilt back quickly - could easily drop a child's limb between then trap it on the way up.
I contacted Southern conversions to see if they had improved upon the design but it appeared not, they just told me it should be fine for lying on but not to walk on it.

For obvious reasons I haven't used it for the last few trips and instead I've insisted on packing all the clothes and kids toys and anything else loose into two suitcases (keeps everything together) which we then use as the base for the 2 bed panels to go on. The downside to this is we are slowly squashing the suitcases and they are a couple of inches too low!
Any ideas to improve this situation. I'd seen on here someone was using "Really Useful 48L boxes" - I guess we could get a few of these and pack clothes etc into them.