DeWalt doesn't actually make the saw, it's a rebrand of another European mfg, which I can't remember right now. It has a really odd 4-arm linkage for the pivoting mechanism. Can't say I've used it, but it's different than all others on the market which use a single pivot.
I have the Makita SP6000J, sold my Festool TS55 and snagged the Makita. The Makita is more powerful, and it really shows. The TS55 struggles even with 3/4" ply, you have to really pace your cuts, while the Makita will go through it like butter. Dust collection is about the same, I've seen just about every saw "win" the dust collection test at least once in a comparison test, so it's really a wash.
The Festool created a decent tool which is still pretty good, but it's becoming harder and harder to recommend for a few reasons.
#1, they keep jacking the prices annually...which is counter-intuitive. Shouldn't it be cheaper as you cut cost and achieve better economies of scale?
#2, has been basically the same for quite a number of years. Others (Mafell/Bosch, Makita, DeWalt) have taken the concept and improved on it in a number of ways, while Festool has stuck to their guns and they're really getting left behind in the market on features.
The Festool rail is it's weakest point, and they've refused to change it, not sure if it's an arrogance thing or something. Makita has an anti-tipover rail, which allows you to make 45 degree bevel cuts w/o the saw toppling over.
The Bosch/Mafell rails include a rail cap to prevent hose snagging on the rail, which is sorely lacking on the Festool (and Makita/DeWalt for that matter). The Bosch/Mafell rails are also incredibly simple to mate, just **** them up against each other and slide the mating rectangle in place and tighten.
Sidenote, if you do need to join two Festool rails, buy Makita's rail joining kit instead of Festools if you want to avoid gouging your rails, they work interchangeably. Festool has known about this for a while, yet they continue to deny that it's an issue, stating that it's user error if you damage your rails (which, likely is...but not everyone is pulling out a torque wrench to align their rails....there are better solutions to the same problem yet they refuse to change).
The DeWalt has that double sided track, which is useful if you damage one side. Oh that reminds me, Festool switched their anti-splinter strip to some **** adhesive that slides off and screws up your zero clearance if you leave the rail in the sun or in a car.
Other than the difference in rails, Makita and Mafell both have a really useful scoring mode, which is pretty effective in eliminating splintering and chipping on laminated boards.
It'd be harsh to call the Festool a bad saw, but it's really not worth the Festool koolaid markup anymore, especially now that it's $200-300 more than the competition after their price hikes, and now that the market has evolved and they haven't.