Boca sells cheap low quality Chinese imported bearings, The 3 levels offered I believe is a type of Marketing Hype Smoke Screen. The low cost versions will probably work as well as the other levels offered but when you take your bearings down to a local bearing supplier you can get far better quality at a lower cost than what Boca sells for. You can do the same on the internet as well if you have no bearing supply house near you.
The ceramic bearings Boca sells have poor quality races but good ceramic balls. Make no mistake about it Boca ain't no bargain.
You can do much better elsewhere.