I’ve been a beta tester for several of his applications. And I’ve seen offers to do so with the OS, but I didn’t want to get into that.
Given the frequency that new MS products crash, crash hard, or crash catastrophically I’m not sure if either a) beta test means something far different to you than it does to me, or b) the level of beta testing you thoroughly did was constrained by your customer/employer to thoroughly testing a somewhat narrow set of circumstances that covered the subset of conditions which were most likely to be encountered.
I have learned through very bitter experience to never, ever install the latest and greatest Microsoft product until at least the second service pack.
Perhaps it’s just me, but I have far too many colleagues with similar experiences to believe that. You are welcome to if that comforts you.