There's a thread on the Train Reaction Device here

http://www.flyertalk.com/forum/trave...on-device.html

That is just a few day old, but it does have some feedback.

I always plan on not having a cart available, if there is one standing there I'll use it, but otherwise I plan on stacking the bags or something, and bring bags I can do that with.

Where it's possible, I'll run out and see if there is a cart at the taxi line or parking lot before going to luggage claim, if flights came in just before, there's usually one unless the guys are picking them up in quickly.

There are some fairly serious portable carts out there that can be folded up, you see people like musicians and trade show people using them, they run in the area of $100 to $200, can fold down, and they can hold 200 to 300 lbs lbs, occasionally you see them strapped to a suitcase coming down the ramp.