The SO PTS1000 is amazing. Mine has never bogged down and gotten stuck, even once, since I bought it well over a year ago, and I cut through a ton of 3/4"+ thick epoxy/fiberglass material. The only thing that slows it down is that the blade eventually dulls and has to be replaced. I get easily bothered by tools that vibrate too much. This thing is as vibration free as an air saw can be.
The only word of caution is that the trigger is pretty much an on/off switch and there is no "feathering", so you can't control the speed like with most air saws like the older Blue Point air saw. I kept my BP air saw, just for delicate situations, but it very rarely gets used. You can use any size sawzall blade with the PTS1000, not just 6" and shorter, just be careful. I use full length hacksaw blades and long sawzall blades to cut through thick foam all the time. The Milwaukee sawzall blades with the weird "ribs" at the base will not fit, just FYI.
Not cheap, but well worth it. One of my co-workers that never spends money on nice tools, was willing to pony up for one after using mine.
Matco makes the MT2219 geared air saw, which my friend has (costs more than the SO and is nice) but when we used them back to back, we both preferred the SO.
