[daz2206]

Please can somebody give me a little advice on vibratory polishers, im debating whether to go out and buy one, the main reason is im spending a lot of time and money on things like cratex style bits to get into tight corners, and powerfile belts (for taking down rough cast) and felt bobs etc.. , i only polish as a hobby and its mainly car engine covers and pipes (alloy) that i mess on with, i really like the idea of chucking the part in and coming back a couple of hours later to find it done. im guessing there has to be a reason why everyone isn't using them ?
is the media expensive ?
is there a lot of different media needed to take it from rough cast alloy to an almost perfect finish ?
on that note, is it possible to get an almost perfect finish from one ?
is the media reuseable ?
is it a long process from start to finish ?

i appreciate not many people on here use these machines but if anybody knows anything at all about them i would very much appreciate their advice on the subject. (thanks in advance)