Beta do a lot of stuff, but I can't think of much that's unique!
They make different grades of tools, and rebrand some others. The quality depends on what you get!
Their top end / aerospace grade / all steel sockets and handles are pretty much first tier, but they are rebranded KoKen tools so you might as well get KoKen and be done with it!
Their top end wrenches are called professional series here in the U.K. and their top end drivers 'BetaMax'. All are good quality tools, Italian made, but not comparable in quality to Snap On. The same can be said of their regular sockets and accessories, but there's nothing wrong with them! Good 'workshop grade'!
Their cheap line, called Beta Easy here, seem to be Taiwanese or suchlike, and no better or worse than any other!
I have one of their 3/4 drive socket sets. Italian made I think, good quality, and having bought it when it was on one of their 'Beta Action' promotions, awesome value!