>>I guess the answer is: Use them for a couple of hours, check the results carefully, and eat that time if there are major problems. I'd think that you would know their usefulness within that time frame, and if they work great -- forget the beta business and bill'em.
>>
>>And of course, illuminate the rest of us :-).
>
>that's exactly what I'm up to =D)

We'll eagerly await your report.