I rog
I have used a hilite somebody brought it along to a model shoot.
While it gives you a nice highkey background . i found where the train attaches to the floor a pain you can see the join.
It was excellent on 3/4 poses , you still need to do a little editing in Photoshop on a full length pose as you can see the join from white BG to the train near the feet of the subject.
On lying down poses and children it can be a real pain as you can see the join on either side of the subject.
I still ended using a bg light to light the bottom section to overcome this problem.