MAROOK  Both version 1.7 & 1.7.1 spawn an AppleScript error when trying to run the disk test: "The specified object is a property, not an element. (-10008)".

Seems like you try set the size of the image to create a bit wrong, but since the script(s) are saved as Run Only, I can't check it out...

This is running on 10.5.1  
(Version 1.7.1)

NAOH  This app is exactly what I need.

With this tool, I am able to stress-test hardware before and after swapping a component.

If the old component gave out after x minutes while this app is running and the new component keeps ticking, I can be reasonably certain that the new component is reliable where the old one wasn't.

If I were to add one thing to my wishlist, it would be to have a feature that gradually fills up physical memory.

(Possibly with an indication of how much physical RAM is being used.)

That way I could use it to pinpoint intermittent faults in RAM as well.

Many thanks for a useful app.  
(Version 1.5)

ARINDAVOODIAN  This tool meant for IT professionals needing to time test a machine. This application will not diagnose the machine for you, you must gather info from the log files and develop a conclusion.  
(Version 0.6)

FLASH1296  Looks dangerous naturally enough, but there ios NOT a single word of HELP or DOCUMENTATION or PREFERENCES. Going to the developer's website provides only an ad for consulting services. Maybe they will give you a discount if they repair your Mac following it getting hosed by this questionable appl'  
(Version 0.6)