Works like a champ. Almost unlimited battery power, I use it almost all the time on my F6 with my MB-40 and I never worry about whether I have enough battery. Compared the the CR123s there is no comparison. I really have no idea how many rolls you can get with the combination as I lose track of when I last charged the battery.
I haven't tried to figure out if it does more than 8 fps as I don't really do that with my film cameras. My D3 is better for that task.
Tom D3, D200, D70, F6, F3/T, F2AS, FM2N
"The Gods have two ways of dealing harshly with us. The first is to deny us our dreams. The second is to grant them." Irish playwright Oscar Wilde