Those SKF production hub bearing units are a very elegant piece of engineering. If you look closely at the one shown in the SKF document, you'll see that the axial preload on the back-to-back angular contact ball bearing set is provided by a swaged flange at the inboard end of the shaft. Imagine how hard it is to get a consistent axial bearing preload in a mass production process using this approach.
I had to replace one of these integrated hub bearings on my '02 Chevy truck front end a while back. The cost for a GM replacement part, including the ABS sensor, was $180. Can't imagine how they manufacture an assembly like this including bearings, seals, shaft, housing, wheel studs, ABS sensor, etc. for that price.