[lincpimp]

You do need good blades. The problem you run into is that the bade will load up with al and you effectively lose the teeth. I have a dewlat jigsaw and it has a function that offers a variable oscilation of the blade. So imagine the blade reciprocating, and moving forward and backward in line with the material. This helps the cutttings escape and stops the blade loading up. Works like a charm. Still not as good as a cheap badsaw, but you can cut an area out inside of something with a jigsaw. I spent around 90 bucks for the jigsaw, and the bandsaw was about 100. Setting up a bandsaw is a bit of an art, but you can use a finer tooth blade and get very nice smooth cuts.