Summary: I purchased this machine as an upgrade to my 12" Delta miter saw. The Delta did not have a sliding blade, and I was limited to the width of a board I could cut on it as a result. The Dewalt's sliding mechanism has provided all of the capacity that I've required to crosscut rough stock before it goes to the jointer.
Summary: High quality product... works great. The light on the blade is wonderful. Better than a laser because the light is on both sides of the blade casting a shadow on the object to be cut EXACTLY the width of the blade and exactly where it will cut. Also purchased the rolling miter saw stand and the two combined are my new favorite tool around the property. Bravo DeWalt!
Summary: I was in need of a new saw that would replace an older 12" Ryobi chop saw (toy). I also wanted to eliminate the remaining nagging need for a less accurate radial arm saw. I had already replaced the need for overhand dados with a good router and the needs for most finish work with a highly accurate sled and fence on my table saw and needed something that could perform as a chop saw but also had the depth to crosscut a decent depth for stairs, flooring and really wide trim...
Summary: Loaded with features, widest range of cut angles I've seen on a miter saw (roughly LH ~50 deg. / RH 60+ deg), smooth action, soft start, and lots of attention to design details. Dust collection doesn't work the greatest, but compared to other miter saws, not bad. Repeatability and precision are much better than my old Ryobi 10", and with the DWS780 LED, alignment to the cut mark is a breeze.
Summary: It would have a higher rating if there was an easy way to get repairs. On the third time of use, the guard flew off and now cannot be reattached. As far as we can tell, the entire 50 lb saw must be mailed back to manufacturer. Cannot use the saw w/o the guard unless one wants to lose a digit or two!
Summary: Overall this is a great saw. Has the feel of a well built tool. The light that shadows the blade is great. I had to make minor adjustments after it was out of the box which was nice. I will chime in on the one improvement that does need to be made and that is the rails for the slide. The saw doesn't slide as smoothly as some of the competitors, but it is still one of the best out there.
Summary: Cut very accurate and square (though I weekly check squareness.) I used it to build a large set of cabinets. I bought a Forrest miter master, which is better than the stock blade. (Which isn't bad.) 95% of my face frames and doors were within 1mm of square. Pros: Heavy, great for a fixed setup. Stiff. Fence is perfectly colinear Basically 0 runout with my forest blade. Cuts those 12" panels like a breeze. Cons: Heavy, a pain to move.