Picked up a TRX Suspension Trainer a few weeks ago from someone on Craigslist since it was ridiculously underpriced. I've been eyeing them for awhile with the idea that I could do some interesting things with suspension training that I can't do for my pitchers using traditional implements, and the constant stream of TRX mocking and humorous posts on IGX led me to pull the trigger on one.
To be fair, **** like this is open for ridicule (though I'm sure it's hard):
But Cressey talked a bit about it for core stabilization work, and it looks pretty promising for rows and other fall-out movements. Hooked it up today and played with it a bit; it's pretty cool. Definitely wouldn't pay the $180 for it, but I got it for half that and it's worth it for me.