I see the latest manual for the Legacy GP35 dated 7/12 still says "Use only alkaline batteries." How long has BCR stuff been around? I am unfamiliar with BCR.
I still don't see the advantage of BCR at $50 each it would take more then 15 years to me to break even replacing them once a year and I would bet most people use there Alkaline batteries more then 1 year. The convenience of not changing batteries once a year is just not worth it to me. I suppose it is good for the environment though.
I know many people like to tinker around with their trains and I do too, but I would rather buy a used locomotive in need of repair then to spend time adding a BCR system to a perfectly good locomotive. I am a retired/disabled industrial mechanic and subscribe to the theory "if it isn't broke, don't fix it"
Like everything in this hobby, to each his own. I am having fun playing with my toy trains my way and I would never try to tell someone else how to run his/her railroad.