If you don't want the fancy digital read out and are fine with an analog gauge you can get a similar load tester for about 1/2 the price.
http://www.harborfreight.com/100-amp...9888-9191.html
Those type of load testers are the best way to see how the battery will respond when put in a robot and you ask it to power 4 CIMS at 100% power.
The problem is that because it does put such a drain on the battery it is not a good choice to use if immediately before a match. It is much better used before you charge up your batteries for the last time before you head to competition.