I am looking at one of those very vessels, except for a different purpose. I do double batches, and chilling in the brew kettle slows me waay down as the HLT and MT have to wait unused for the two hours that the BK is tied up, instead of it all being busy. So, I'm planning of getting one of these conical tubs, put the mother of all coils in there and use it as a chiller. The great added benefit is also that the cone will help collect trub and I can easily dump the first quart with all the gook in it, and then splash away into the fermenters.
And, if ambient temperatures are right, I could also ferment in it.
In discussing this with a knowledgeable person he pointed out that, most likely, this tub is welded and not seam free like our buckets. He expressed concern that these welds may not be as smooth as we would like and that they may have crevices that can harbor bad bugs......
With that in mind I was going to look at one of them before I bought.....
BTW, I think I sourced them cheaper here.....
http://www.plastic-mart.com/category.aspx?cat=19