I agree with Tom - the DeWalt looks like a re-labeled version of the PC 4212 jig. (I'm also a PC 4212 user.)
Among the fixed-spacing jigs, I think the PC 4212 is among the best. Well made, relatively easy to set up, and fairly versatile.
For through dovetails, a fixed-spacing jig imposes some limitations that need to be considered, though. For through dovetails, having symmetrical joints is important. That imposes limitations on the width of the stock, so as to match the geometry of the jig.
From the PC 4212 manual:
"The optimal widths for creating dovetails are in 1" increments plus 1/4" (1-1/4", 2-1/4",
3-1/4", etc.). Other widths will work, but will not be as attractive.
NOTE: If you are using the 4215 miniature accessory kit, the optimal widths are in 1/2" increments plus 1/8" (5/8",
1-1/8", 1-5/8", etc.)."
Note that "other widths will work" is relative here, and applies more to half-blind DTs than to through DTs.
If that limitation is too restrictive for you, you'll need to look at the variable-spacing jigs, like the PC OmniJig or the Leigh DR4 Pro, among others.