never had the chance to cast a 50b. sometimes you see them on pier and surf forums. not sure why shimano dropped it, maybe the low profile reels just made it not profitable. actually trying a chronarch 150ci4 this year...just hope it holds up to the salt like the calcutta B's do. rock solid reels.
Have a Calcutta 200GTB that is in excellent condition, bought last year in May. Just recently serviced with the rest of my reels (flushed bearings, raceways cleaned, RR yellow lube) and has Pline 15lb CXX $150 shipped to CUS.