Hi Leon
I forgot to ask (we all did!) what your intended use will be!
If you want to follow quick moving targets, such a birds in flight, racing cars/bikes, etc. then maybe a Gimbal mount (
Wimberley Kirk Jobu) might be more suited for lenses over say, 300mm?
If your subject is relatively static but you want some ability to nudge the camera/lens, then it could be that the B&S is more suited?
Cheers
Dennis