I just had one and it was good. well diverticulitis but good. just follow directions on the liquid med you drink and what you can and cannot have to eat. other than that, it's easy. and someone to drive you home.
also remove your socks and bra-let top! I didn't. they weren't happy but worked around it. I offered to remove it just didn't think it mattered because there were no snaps. oh well, live and learn. hoping that was my last test anyway.