i'v had wobbly bolts for awhile now and don't think they are any different from normal bolts . its only the top washer that moves around and when tightened they do the same job , i haven't had a wheel come flying of at high speed so don't see any problems with them
A friend been using it for 4 years already so that he could fit so light weight OZ 100pcd wheels on, so far so good, but the garage did recommend to change them to new pieces after a few years just to be on the safe side.