All of the Big G's I played on were in commercial settings and were near junk. They recovered the last one I played on six or eight years ago and it was still little more than junk. As noted. bumping them or leaning makes them move, pretty typical. I don't remember cushions and pocket shelves and such but they suck up balls like a hoover sucks up dust.
I think even for home use it would have to be restored to better than new condition. I think the pockets would still play like buckets. I played in rooms with all Big G's way back when. The honky-tonk across the street from the service station I was building my race car in had a half dozen or eight Big G's. I would close up at eight or nine, work on the car awhile, walk across the street and play pool a few hours, back to work on the car. Finally sleeping a couple hours and do it all over again. The only thing those tables had going for them is they were convenient. I played on a few more big G's scattered around. I would play on most anything somebody would gamble on. I can't remember ever playing on a big G that I liked.
I might be wrong after all of these years but I strongly advise staying away from the big G. One thing worth knowing, estate sales typically discount everything remaining 50% on the last day even if it is a two day sale. I could have bought a beautiful Connelly or something home table, nine foot for $200, looked like new although it might have been ten years old or older. 30mm or thicker slate, nice table. I didn't have help to move it and didn't have room for a nine foot table. My back had flared up the week before and I had to pass. By the last day few offers will be refused. That table sold for $190 and I think was worth more than any big G. I think it went for about ten cents on the dollar!
Hu