Several of us have built rifles with the Dumoulin actions.
They're a little rough.
They're fairly heavy.
The triggers that Sarco packed with them range from "okay" to absolute garbage. It was a cheap design with no quality control.
Whomever "fitted" the crap triggers ground the sear lug on the cocking piece (poorly), which often requires rework and may necessitate replacement in some cases.
Because of the ground sear lug changing the striker location when cocked, the cocking pieces were also attacked with a grinder to get the safety to engage in a new location. Short of building back up with Tig and re-heat treating, the cocking pieces usually can't be saved.
Cocking piece replacement is usually necessary. But, the tail of the firing pins have been oversized on mine, as well as several other builders. So, you still have to modify the replacement cocking piece or turn down the firing pin tail.
Some people have gotten actions with okay triggers, and safeties that engage properly with the slot ground by the monkey with a grinder. It's ugly, it's wrong, and it irritate me. But some people have lower standards. If that is the case, and you're okay with it, then be happy.
But you still have to screw on ugly Weaver bases, machine the receiver to take better off the shelf bases, machine your own bases, or fork over a chunk of change for the special rings (Sunny Hill, ~$400+; or euro, $200-$1000 + applicable fees and shipping)
If you want to build on a virgin action from scratch, and customize as you go, they're okay.
If you want a turn-key commercial Mauser action to screw a barrel into and drop in a stock, it's not the right tree to be barking up.