As much as I would love mine to be indoor rabbits(all the time I would save), they are, Smokey in particular, happier outdoors (maybe they would be different if they had their own room in the house). They are far more active and if you're paranoid like me, you can still spot any problems easily and quickly.
I lock mine up at night and even though they have a large run on paving slabs, I don't leave them out in it all night, I would just worry too much.
They have heat pads in the winter and in the summer I put net curtains over the run.