I completely agree with what everyone is saying here; From the anxiety of moving the first couple games and wondering "Why did I buy this thing! I am going to get launched over the stairs and die!".... to "Wow this is like an elevator for pinball machines".

I have had mine for about a year now. We moved from a walkout basement to a house with no walkout (but a nice staircase from the garage). The escalara made this possible. It has been pointed out already as far as what to do but to reiterate:
1. PRACTICE without a pinball machine and get to know the "center of gravity change" when the wheels are going down each stair. Also note how far the small wheels have to be from the ledge when practicing.
2. Make sure the machine is strapped in tight, and that the strap lock (the pin that locks the seatbelt cam) is in the correct position
3. STOP on every stair. Do not try to rush things and just keep on going.

Another pro to the forklift attachment: This thing rocks for taking off Pinball 2000 heads. Just put the forks up to the back of the head, Rotate the head onto it back on the forks, and slide the escalara back. Even then, you can lower the forks a little (once again to put the center of gravity of the p2k head more in the middle), strap it, and go up/down the stairs accordingly.

Larry at FlipnOut made some Youtube videos too that I watched to help with the practicing.

Hope this helps
-Jeremy