It is actually better than the Datachem software at 1/3 the price. The Radware Software has more questions, allows you to print out tests/answer keys, and add questions too!
Datachem: Questions: "Over 600" Price: $299
Nevada Technical Associates: Questions: "100's" Price: $195
RadWare: Questions: "1,100" Price: $85
It's a no-brainer, thats why I sell the Rad-Ware CD on this site.