i begrudgingly bought a bosch multi tool a couple of years ago to remove floor grout that had gone a bit funny.
couldn't think what else i'd ever do with it so i was going to ebay it once i'd finished the job to try and recoup some of the money.
since then i've found a million uses for it and it comes on every job with me. it can do things that no other machine can do and does it quick and neat. really gets you out of trouble at times, i don't know how i managed for so long without one!
so glad i didn't sell it in the end - it's paid for itself many times over and is now as integral a part of my tool kit as my hammer and drill.
the only negative is that the attachments are a bit pricey.