I just got the jig saw and right away was impressed with how well it cut. I've always had the cheap jig saws...since for a jig saw you only need a machine that moves the blade up and down right?....WRONG! You need a blade guide that stabalizes the cutting edge, you need a powerfull machine behind it to provide a consistant speed stroke, you need a balanced machine to avoid fatique and not have the machine vibrate.  Also, the Bosch blades cut like butter thru the wood.  I was able to make repetative 1/8th cuts in pine without the blade wandering and I was holding the wood on the bench only with my hand..hardly any vibration.