Now that I've actually used the tool I 'm very pleased. Not the fastest, but for unusual cutting tasks, it'l be fast enough. I have removed the depth gauge, and it's holder, as I don't feel a need for it yet. One allen screw holds the whole assembly on. Blades are expensive, though there are some aftermarket ones now. Multifit is one company; and the savings are significant. They have a section just for Porter Cable.
The tool was originally invented by the German Fein co. as a means of cutting casts off of broken limbs. The oscillating blade won't cut skin. I've seen a video of somebody touching a moving blade; said it tickled. I think I'll wait until I accidentally touch a moving blade. 8-) Fein's patent has run out, so there are a lot of different brands making these tools.
Some projects that the tool will be used on:
Cutting into a trim board on the house without removing said board to stub in a new piece of trim because of rot.
Scraping wall paper. I've played with it a little in the studio; it will probably be as efficient as steaming off wall paper, and probably far more pleasant.
Cutting between two porch floor boards that have buckled, to give them some room to be laid back flat.
I'm also looking forward to trying it the next time I need to enlarge a rabbet. I'm thinking this might be the right tool for the job. It can plunge cut, so the corners of a joined frame will be square, and the model I have has a depth gauge, though a masking tape line on the blade would work also.
The machine pictured, Porter-Cable PCE605K, link at right, I chose for several reasons. Good reviews on the interwebs. (We know if it's on the interwebs, it's true). Corded, as I thought the need to own and keep charged multiple batteries, was less convenient that just plugging it in, and running until the job was done. (Which, should the need arise, not preclude me from buying a cordless one). I own several Porter Cable tools already, and have been very happy both with the design of the tools, and the availability of parts and accessories. That last is huge. The Porter Cable, with a nice case, and a good, though mostly sand paper, assortment of accessories was $99.00 on Amazon. The box stores have them at $130.00. Harbor Freight has their brand at $20.00. Fein has some as high as $400.00
As I've played with the tool I've decided that it will be as precise as I am; it is a hand tool, with out any real provision for guides or fences. I'll need to be patient, as forcing the tool is just going to ruin the blade, and they are expensive, though as more adopt these tools, blade prices will come down.
So, keep calm, carry on, and sally forth to cut something ... 8-)