Review (4/5): Base & Rollers are Great!  Pan is a little thin.
It's a bit bigger than we envisioned. The base & rollers are excellent. The tray is supported by a partial base plate, and then a permeter of sturdy tubing, into which the tray is supported and sits. The only disappointment is the quality of the tray insert itself. I do believe it is stainless, but we have noticed very small specs that look like rust? It is made of pretty thin material, and the edges are not rolled (like a cookie sheet). Our tray had a ripple on one of the short edges, that extends into the base of the tray (like it was banged), but our packaging was fine. Perhaps it happened before packaging?
Our use is a portable tray for a hair salon, so the tray defect is a bit disturbing, because of the astetic nature of this business. My only suggestion to the manufacturer would be to make the tray somewhat more robust. Overall we believe it will fill our need and we've decided to keep it.