We've had our van two years now, and thus far have nothing but positive comment on the VW Cali seat/bed. Having used it as a passenger I can report that while it's not quite as comfortable or supportive as the rear seat in a car (how could it be? It has to be virtually flat in bed mode!) it's more than acceptable.
How anyone can travel any distance in a seat fixed right at the back of the van is beyond me. Having it fully forward on its rails makes it pretty much like a car, so you can talk to the folk in the front seats, and they to you. You see out the windows too! And unlike most of the other alternatives, having your feet on the floor is nice. As indeed is having acceptable head-room.
Thus far, we've never needed to remove it for load-carrying, but on the one time it was helpful to have a bigger load space at the back, being able to move it forward was helpful. The drawer under the seat is very useful indeed! Our table stows in the seat back recess, with a removable support attached to the front of the seat - this is superb, and we can't see how having the table attached to the units can be a practical option.
Overall it was worth every penny.