I wonder if the B1 head can hold a camera in vertical orientation with a 70-200 f/18 or a 300 f/4 that don't have tripod feet, as my two lenses of that size don't.
Anyway, it's rated to hold about 10 lbs more than a Manfrotto 498RC2, so it should be OK if the ratings are accurate and comparable between the two companies.
I assume by "tripod feet" you mean the tripod mount ring or collar. The B1 will be able to hold up your camera with the 70-200 f/2.8 IS without much of a creep after tightening the knobs. There is a little bit of creep after setting up and letting go of the camera and lens but not as much as with the Manfrotto 488RC2 (the predecessor to the 498RC2). Once the B1 settles in after that initial creep, it stays put.


