I have had one personally for over a decade. They are based on the Skill Mag77 (Bosch bought Skill), just with a magnesium shoe and better guard (makes taking a thin cut possible without holding the guard back). Mine has the plug that uses an extension cord and has no cord of it's own. Great feature for a working carpenter as you are always pugged into a 100' cord.
It has been used and abused, as I was a contractor and carpenter, and is a solid tool that I put it in the same must have category as; Occidental Tool bags, Stabila levels and Hitachi framing nailers. Buy it, change the oil and run it. Or, just buy it and run it. I think I ran mine with the same oil daily for 5 years or so.

I've never heard of the out of square issue mentioned above. I can't say that I've seen them all but, for the 25-30 that I have purchased for my old crews, it was never an issue.
If all that praise wasn't enough... After 3 months probation for a new carpenter I would buy that saw, tool bags, nailer and levels for the guy. If it is clean I'd offer $100. It's a good tool.
Hope this helps.
Cheers,
Chris