I haven't worried about it for nearly 40 years. I don't shoot tournaments or anything like that any more. I did for years back in the 70s. I really don't have a problem with left and rights either up or down hill. I think for most average shooters and maybe even better than average.. it's an anal drill. If you have a problem holding the bow correctly for up an down shots, leveling the third axis probably won't really give you much because your form sucks. LOL Now if you're hunting gnats.... it might help.