I have a Dewalt 12" it's old, good for cutting 2x4s for roughing in. Can't get myself to throw it away. I also have a 12" Milwaukee with a digital readout. It's nice, you can set it to .1 degree one way or another. The problem with the digital readout is it assumes the fence is square to the blade. Well it is on one side after some fussing but not the other. So the next time someone mentions a digital readout don't get a picture balloon of perfect miters necessarily.
The other problem is its ability to hold the large blade steady at the cutting end, because of that it doesn't give a good smooth cut, but it's close. If I could do it again I'd consider it in a 10" version. But I don't think I'd do it again because......
The Kapex is an excellent saw it's expensive and it's not perfect it has its oddities but it cuts smooth 90 degrees on both sides of the blade. I have never had a saw that precise, ever. I only have to use the factory presets at 45 without test cuts.
Your children shouldn't go hungry but as the old saying goes, something like, cry once.... I don't remember it all but it does have some validity in this case I think.
If you can and only if you can, bring one home for a 30 day trial just set it on your work bench straight out of the carton cut a straight edged board and see if you don't get a perfect cut.
Mark