I bought a "Fein Multimasterr" about 4 years ago to remove the grout between tiles in my bathroom. Worked perfectly.
It's fantastic, made in Austria (not cheap) and it can do jobs no other power tool can do.
It vibrates so it's very safe... Like a plaster cutter in a doctors office.
Since it's release other brands have copied it and there are now lower cost options but the "Fein" has the best range of tools and attachments.
