On my side I have had no issues with the kit bearings and that is not factory driver BS. I prefer the blue shields on my cars and generally change them out on build if I have them or when I get them I put them in. On the 415 I have not changed them out yet and they are degreased and re-oiled. The only bearings I have not cleaned and relubed is the 950's out on the LW after hearing the few problems that popped up here.
As far as optional bearings I will be trying the Speedmind ceramics shortly in the car.

Dave you commented on a rear bulkhead change I would assume this is to better accomodate the LW arms. It should negate having to cut the 45d bevel on the rear arms you currently have to do now.