when I have used the reversal PLUS X black & white stuff and had a true telecine - it's grain is so fine, that it looks better than most 16mm footage.
CHECK THIS OUT :
http://www.triggerstreet.com - search for the shrot called SIMULACRUM
shot half with PLUS X, and TRI-X (the TRI X is for the darker, grainey shots, and the PLUS X is the sharp as hell daytime shots with loads of detail & crisp images.
(not actually a shameless plug, but a demonstration) -
in quicktime, also available here :
http://www.singlereel.com/directory/clip-19648.html
I had the black & white developed at FILM CRAFT LABS in Detroit and telecine'd at THE TRANSFERSTATION in California on a RANK CINTEL, and it was the best Super 8 vide transfer I had ever seen. It was really good Black & white footage.
If you have the light, the PLUS - X Reversal is just as good as ANYTHING negative stock for black & white.