With the newer faster and more stable Macs and OS's this utility is not as useful as it once was. Gauge PRO reports not only the type of CPU but also its speed - to a hundredth of a megahertz. You can't always tell how fast a computer is by looking at it. GURU is the industry standard tool for determining all possible memory upgrades for Macintosh. System 7 and higher.
Most people only fall one side of the utility wall.
You are either a fan or not. I have to say I did start using TechTool more when Norton's was at version 5.x, but these days I can't fault it's abilities. It's my humble Personal choice. TechTool does have a wider spread of features and bells but most home users might never use them. TechTool Pro allows users to test and repair their Macintosh computer with a few clicks of the mouse.