Yeah it's been discussed a lot. I think I have a blog entry on it as well on my site. That said - I deal with Enduro a lot. ABEC 3 bearings just don't tend to last as long as the 5's. Most likely from a difference in seals possibly(?) - don't know. Just know that every ABEC3 we eventually replace is replaced with a 5 and lasts longer than the 3's did.
Their Hybrid ceramic - they're fun to show people. ....
Honestly I really like Kogel bearings. More for the total construction and seals. Such a higher life out of them. I would LOVE to say there is a performance difference but I will leave that up to others to debate. Unloaded bearing freespin vs loaded is kind of meaningless but a lot of fun to show people.