I received this last week and I've used it a few times. I park my bike on a patch of grass next to my driveway and, if both cars are in the drive, I have to do a 42 point turn on the grass to get out again. Not easy with my fully-loaded GS.
The Turn A Bike does exactly what it says it will. It makes it easy to spin around a big, heavy bike. It's not ideal on soft grass - I actually dropped my bike the second time I used it - but I've learned to compensate by standing next to the bike and gripping the bars instead of turning it from behind the bike while lifting the rear wheel.
It's worth the cost, and it's making my life easier. If they made a bigger one that would be more stable on grass or dirt, it would be an improvement. (Posted on 8/4/14)