Honda Car Forum

Saw these data logger chips at Sears - for $99 you get a chip that clips
onto the OBD2 connector, records data for up to 75 hours- plus a PC software
package for data analysis.
My questions:
1) is this worth the price?
2) Once I have the data, how do I know what to do with it?
3) Do I then need another $200 worth of shop manuals & tech data?
4) Will my 2 later model cars ('98 acura Integra, '98 VW Cabrio) work with
it?

Any feedback woul be much appreciated.