Well I just got the wheel in. The grant wheel with adapter and hardware weighed in at 3.25 lbs. My stock wheel with airbag was 8.25 lbs. Bathroom scale, YMMV.
I did what Lonnie and Mike did-pulled the fuse and disconnected the battery and let it sit. It took me a while to do it because I had to grind and regrind the black cosmetic cover that comes with the adapter to keep it from rubbing the column. I also drilled a hole into the adpater for the airbag wires to feed through-so it will be easier to convert it back to the stock airbag wheel if necessary.
Still gotta go drive it, but that would involve musical cars in the driveway.

EDIT: Lonnie I used the Grant Formula 1 wheel # 1064 13.75" diameter, 3.75" dish.
http://www.jegs.com/photos/4701064.jpgIf you see my other thread it's basically an attempt to be able to space the steering wheel closer to me while getting something a bit smaller.