What type of lenses are you using?
IMO I find the cheap macro attachments (Tubes, reversing rings etc.) work real nice with older all-manual lenses coz then u have instant access to the exposure ring. With modern lenses i find it a bit annoying not having immediate control (cos theyre no electronic connections in the cheap attachments.
BTW just a newbie hint, dont forget to move yourself WAY closer to the subject than for a 'normal' photo. otherwise u wont find focus.