TechTool launches a small black-and-white interface with a few buttons; its compactness reflects the utility's small feature set. It scans your system and outputs a log of its findings: basic stuff, such as motherboard and BIOS info, chip manufacturer and model and speed, system manufacturer, operating system, and so forth. All this info is already accessible from your system, so TechTool's features are redundant, but may be handy for some novice users.
TechTool performed quickly in our tests, but we had some issues. First, its output stated at the top of its report, "This user does NOT have administrator permissions!" That wasn't true, which puts the rest of TechTool's accuracy into question. Second, when we clicked the System File Checker, it first warned us that "this tool can be dangerous if not used properly," and then it failed to launch the checker.
In summary, there's little to recommend this little app, unless you just want an easily accessible, quickly functioning data grab for your system.