just saw a new tool at costco. One of those fast oscillating affair for plunge cutting, grout, etc. IIRC it was $50 with a whole bunch of toothed and carbide (?) grit blades, sand paper etc. I don't know anything about those things but that seemed like a low price given that I just saw some blades at HD that were like $5 or $10 ea. But is it any good? Not a major brand. Power, interchangeability of blades, etc? Don't see myself using this much at all but always been intrigued by the concept. Thoughts? Worth it just to play a bit with or have just in case for the odd job like a frozen bolt in an inaccessible spot?