So - the scéail is that I have the .Net printer watch component working reasonably well now and think it is a viable component for selling - but I'd need to do a beta test program first as there are so many types of printer driver and operating system combination to test it upon.

The question is - should the beta version be time limited (because otherwise why would anyone move on to the production version?) and should participants in the beta who have contributed get a reduction on the price of the finalised component?