Got RPM.
The ESC isn't a joke, but the claims are. It is really quite a good little 7.2V ESC.
Those Amp ratings are calculated by adding up the current capability of each FET in the ESC. A common marketing ploy for cheap Chinese manufacturers.

diy-pro
The 3 'low drain' 400's draw less than 15a total spinning a 30mm 3 blade, fine pitch prop each. I only run the boat on 6V. But I must add that I did replace the plug with a Deans plugbecause I know that the Tamiya plugs melt at around 15-20A.
The modelof the Bismarck is 1750mm long & carries about 10kg of ballast.

I don't have that other ESC you posted, but again, with the small wires & the Tamiya plug, 15 to 20A would be the limit. But the ESC itself may be able to handle a few more Amps. But definitely not 320A

Here's the Bismarck.
[link]http://www.youtube.com/watch?v=fe2jpRYJAYE[/link]