This kit really looks great! I think the extra caster (you can never have too much!) plus the use of the bearing will give great results. I theorize, with my experience from all of the different Whiteline ALK's, that this kit will be pretty harsh on sharp edged impacts like expansion joints or Bott's Dots (reflectors) at low speed. I think it will provide all, if not more of the benefits of the Whiteline ALK. The only trade off, IMO, will be the aforementioned harshness compared to, say, the Whiteline comfort ALK.
Its great to see more options in this area of performance, especially in the higher end.