This is the saw to use for heavy-duty, demanding work.
We bought this 120VAC powered saw for a particularly demanding demolition situation. We had to sawzall dozens and dozens of metal pipes (up to 6" diameter SCH 80) and associated supports for 3 days straight. Other removal options were not open to us on this particular job. Saw has excellent performance, it's as smooth as these saws can be, and very powerful. [Our 28V battery powered saw gives great performance, but it's not really intended for hours and hours of use, even with multiple batteries]
I've found Milwaukee stuff is usually well-thought out, ruggedly built, and gives good service life. Like with many high-end tools, this high level of performance comes at a price, but for us, it's well worth it.
If you need a heavy-duty, industrial/commercial/professional grade sawzall this is it. Highly recommended.