No, it doesn't go upside down (which is a shame!!)

We love the Paris one, so don't think we'll be too keen on the WDW one, but from what I gather, it's quite different in what you see too (or lack of)..
My sister did not like the WDW, she had been on the Paris one first and thought they be similar, she said she realised that the wdw was not going be as good when she saw that the safety bar went over the lap.

I'm always amazed that the MK Space mountain has a maximum speed of less than 30MPH. It seems much faster to me, probably because of the darkness during the ride.
Steve.