I think if you re-read the post you will find that this user has said nothing about using this on a production site, he is stating that if you have BETA testers and they have signed up and posted a few bits of information you can do a simple migration of information from one BETA to the next for some BETA testers who are testing on there own this might be useful rather than signing up again and again when a new BETA is released and installed.

Although I can understand the reasoning I can also see more see the other side of things also in that this can be detrimental to the testing but it's inevitable that users will always try to use the BETA as a production software no matter how many times it is stated not to.

If you read further down can someone please from Boonex provide a solid answer to the question of the potential upgrade path, if it has been answered then please post a link to the answer.