TechTool Pro promised to do so much more at a very attractive price. I had intended to write a short review as a guide to others considering whether to upgrade to TTP but it arrived just three days before Mac OS 8 and I decided to wait for the Mac OS 8-compatible DNA file. TTP came on 3 high density diskettes and installed without drama.
Preferences allow one to select animation, sound and a prompt to save a report of the test results.
Animation and sound are nice but not necessary. Animation uses QuickDraw 3D, takes a while to load each time and does not work if you disable all the extensions. Each of the 21 tabs has a suite of tests that may be run. The manual should but doesn't list the possible outcomes of each of the tests. The test wouldn't check my CD ROM drive at ID 3.