yup. recently i've borrowed a BG-E2 frm my friend to use with my 40D.
tighten as per normal, not too tight, it never loosened. i'm never afraid to just hold the camera by the BG with 1 hand (with lens and flash attached somemore) lol.
like what canonG9 said, just double check once in a while if u are worried.
haha. wait till u try that with a 300mm lens. :bsmilie: