I got the DWS779 it’s the same saw as the 780 except it doesn’t have the shadow line but that light isn’t worth the extra 200$ plus it’s better to learn how to not need the shadow.
DEWALT is a top power tool manufacturer. Two years ago, I bought one of these DEWALT sliding compound miters saw.
It's by far my most favorite miters saw I have ever owned.
I upgraded to a a Dewalt 779 from an old Chicago Electric miter saw. The 779 is the same as the 780 model that you linked to but it doesn't have the LED shadow cut light. I bought my 779 for $350 from Amazon so you can wait a bit until to go back down in price again. I'm not sure which region your from, but if you're in the US you can also shop on HomeDepot.com and get the Dewalt 779 version right now for $349.
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